{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64576", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.798Z", "datePublished": "2026-08-05T08:09:32.529Z", "dateUpdated": "2026-10-19T20:48:42.772Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:57.222Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: initialize extack in nh_res_bucket_migrate()\n\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\n\n Oops: general protection fault, probably for non-canonical address ...\n KASAN: maybe wild-memory-access in range [...]\n RIP: 0010:string (lib/vsprintf.c:730)\n vsnprintf (lib/vsprintf.c:2945)\n _printk (kernel/printk/printk.c:2504)\n nh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\n nh_res_table_upkeep (net/ipv4/nexthop.c:1866)\n rtm_new_nexthop (net/ipv4/nexthop.c:3323)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n netlink_sendmsg (net/netlink/af_netlink.c:1900)\n Kernel panic - not syncing: Fatal exception\n\nZero-initialize extack so _msg is NULL on error paths that never set it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered via local RTM_NEWNEXTHOP over rtnetlink (sendmsg \u2192 rtnetlink_rcv_msg \u2192 rtm_new_nexthop \u2192 nh_res_table_upkeep \u2192 nh_res_bucket_migrate), not by processing remote packets.\nAC:L - An attacker can create resilient nexthop groups, ensure notifiers are registered (e.g. VXLAN pernet init), force bucket migration, and induce the kzalloc -ENOMEM path; stack contents are groomable, with no attacker-independent condition required.\nPR:L - rtnetlink_rcv_msg requires CAP_NET_ADMIN via netlink_net_capable() against the socket netns user_ns, which an unprivileged user obtains with unshare -Urn, so privileges are Low not High.\nUI:N - The attacker issues the netlink nexthop configuration and triggers migration themselves; no victim action is required.\nS:U - Impact stays within the host kernel networking authority; this is a local DoS/disclosure bug, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - pr_err_ratelimited(\"%s\") dereferences an uninitialized extack._msg pointer as a C string, enabling an attacker-groomable wild kernel read into the log, consistent with treating unbounded wild/OOB reads as Confidentiality High.\nI:N - The defect only reads through the stale _msg pointer for printing; there is no write, free, or other memory-corruption integrity primitive.\nA:H - The wild %s dereference causes a general protection fault / KASAN wild-memory-access and kernel panic, as shown in the fix commit report, so Availability is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/nexthop.c"], "versions": [{"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "eacd2e2117e8682f937967fda1022e7f1c22d91a", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "37bbd7e1d8df0bec3d187e961783e20c30533d2c", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "c0936c131a71657afc635d0db2ab096d15d473e1", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "d536bf205c71f700f6de2086038c3e1d77724715", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "18506d7263768d76ac8e057ba55a4d9da50aad66", "status": "affected", "versionType": "git"}, {"version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "6347c5314cee49f364aaf2e40ff15415a57a116e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/nexthop.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a"}, {"url": "https://git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c"}, {"url": "https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1"}, {"url": "https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d"}, {"url": "https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715"}, {"url": "https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66"}, {"url": "https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e"}], "title": "nexthop: initialize extack in nh_res_bucket_migrate()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64576", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:43:11.555389Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-457", "description": "CWE-457 Use of Uninitialized Variable"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:48:42.772Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64576", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:43:11.555389Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-457", "description": "CWE-457 Use of Uninitialized Variable"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:43:12.371Z"}}], "cna": {"title": "nexthop: initialize extack in nh_res_bucket_migrate()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered via local RTM_NEWNEXTHOP over rtnetlink (sendmsg \u2192 rtnetlink_rcv_msg \u2192 rtm_new_nexthop \u2192 nh_res_table_upkeep \u2192 nh_res_bucket_migrate), not by processing remote packets.\nAC:L - An attacker can create resilient nexthop groups, ensure notifiers are registered (e.g. VXLAN pernet init), force bucket migration, and induce the kzalloc -ENOMEM path; stack contents are groomable, with no attacker-independent condition required.\nPR:L - rtnetlink_rcv_msg requires CAP_NET_ADMIN via netlink_net_capable() against the socket netns user_ns, which an unprivileged user obtains with unshare -Urn, so privileges are Low not High.\nUI:N - The attacker issues the netlink nexthop configuration and triggers migration themselves; no victim action is required.\nS:U - Impact stays within the host kernel networking authority; this is a local DoS/disclosure bug, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - pr_err_ratelimited(\"%s\") dereferences an uninitialized extack._msg pointer as a C string, enabling an attacker-groomable wild kernel read into the log, consistent with treating unbounded wild/OOB reads as Confidentiality High.\nI:N - The defect only reads through the stale _msg pointer for printing; there is no write, free, or other memory-corruption integrity primitive.\nA:H - The wild %s dereference causes a general protection fault / KASAN wild-memory-access and kernel panic, as shown in the fix commit report, so Availability is High."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "eacd2e2117e8682f937967fda1022e7f1c22d91a", "versionType": "git"}, {"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "37bbd7e1d8df0bec3d187e961783e20c30533d2c", "versionType": "git"}, {"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "c0936c131a71657afc635d0db2ab096d15d473e1", "versionType": "git"}, {"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d", "versionType": "git"}, {"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "d536bf205c71f700f6de2086038c3e1d77724715", "versionType": "git"}, {"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "18506d7263768d76ac8e057ba55a4d9da50aad66", "versionType": "git"}, {"status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "lessThan": "6347c5314cee49f364aaf2e40ff15415a57a116e", "versionType": "git"}], "programFiles": ["net/ipv4/nexthop.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"status": "unaffected", "version": "0", "lessThan": "5.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.148", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.101", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.6", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv4/nexthop.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a"}, {"url": "https://git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c"}, {"url": "https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1"}, {"url": "https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d"}, {"url": "https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715"}, {"url": "https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66"}, {"url": "https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: initialize extack in nh_res_bucket_migrate()\n\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\n\n Oops: general protection fault, probably for non-canonical address ...\n KASAN: maybe wild-memory-access in range [...]\n RIP: 0010:string (lib/vsprintf.c:730)\n vsnprintf (lib/vsprintf.c:2945)\n _printk (kernel/printk/printk.c:2504)\n nh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\n nh_res_table_upkeep (net/ipv4/nexthop.c:1866)\n rtm_new_nexthop (net/ipv4/nexthop.c:3323)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n netlink_sendmsg (net/netlink/af_netlink.c:1900)\n Kernel panic - not syncing: Fatal exception\n\nZero-initialize extack so _msg is NULL on error paths that never set it."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:57.222Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64576", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:48:42.772Z", "dateReserved": "2026-07-19T15:36:31.798Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-05T08:09:32.529Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/nexthop.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "eacd2e2117e8682f937967fda1022e7f1c22d91a", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}, {"lessThan": "37bbd7e1d8df0bec3d187e961783e20c30533d2c", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}, {"lessThan": "c0936c131a71657afc635d0db2ab096d15d473e1", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}, {"lessThan": "3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}, {"lessThan": "d536bf205c71f700f6de2086038c3e1d77724715", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}, {"lessThan": "18506d7263768d76ac8e057ba55a4d9da50aad66", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}, {"lessThan": "6347c5314cee49f364aaf2e40ff15415a57a116e", "status": "affected", "version": "7c37c7e00411b3d1e0c5292368317aca69d1f324", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/nexthop.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"lessThan": "5.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: initialize extack in nh_res_bucket_migrate()\n\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\n\n Oops: general protection fault, probably for non-canonical address ...\n KASAN: maybe wild-memory-access in range [...]\n RIP: 0010:string (lib/vsprintf.c:730)\n vsnprintf (lib/vsprintf.c:2945)\n _printk (kernel/printk/printk.c:2504)\n nh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\n nh_res_table_upkeep (net/ipv4/nexthop.c:1866)\n rtm_new_nexthop (net/ipv4/nexthop.c:3323)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n netlink_sendmsg (net/netlink/af_netlink.c:1900)\n Kernel panic - not syncing: Fatal exception\n\nZero-initialize extack so _msg is NULL on error paths that never set it."}], "id": "CVE-2026-64576", "lastModified": "2026-10-19T21:17:48.000", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64576", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:43:11.555389Z", "version": "2.0.3"}}]}, "published": "2026-08-05T08:16:37.483", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-457"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: nexthop: initialize extack in nh_res_bucket_migrate()", "id": "2511419", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511419"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnexthop: initialize extack in nh_res_bucket_migrate()\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\nOops: general protection fault, probably for non-canonical address ...\nKASAN: maybe wild-memory-access in range [...]\nRIP: 0010:string (lib/vsprintf.c:730)\nvsnprintf (lib/vsprintf.c:2945)\n_printk (kernel/printk/printk.c:2504)\nnh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\nnh_res_table_upkeep (net/ipv4/nexthop.c:1866)\nrtm_new_nexthop (net/ipv4/nexthop.c:3323)\nrtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\nnetlink_sendmsg (net/netlink/af_netlink.c:1900)\nKernel panic - not syncing: Fatal exception\nZero-initialize extack so _msg is NULL on error paths that never set it.", "A flaw was found in the Linux kernel. During nexthop resolution, an uninitialized variable is used if a memory allocation fails. This can lead to the system attempting to access uninitialized stack memory, causing a general protection fault and a kernel panic. This vulnerability results in a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-64576", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64576\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64576\nhttps://lore.kernel.org/linux-cve-announce/2026080524-CVE-2026-64576-38cf@gregkh/T"], "threat_severity": "Moderate"}