{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98629", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.361Z", "datePublished": "2026-10-18T15:19:50.589Z", "dateUpdated": "2026-10-19T09:22:57.219Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:22:57.219Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: fix manual hash table handle IDR aliasing\n\nA u32 hash table created with an explicit handle ('tc filter add ...\nhandle 801: u32 divisor N') keys its IDR entry on the raw handle, while\nthe destroy paths free it under handle2id(handle). The two key domains\ndisagree for handles in the 0x800..0xFFF htid range:\nhandle2id() folds them back into the auto-allocated id space (1..0x7FF).\n\nA manual table therefore leaves its raw-keyed IDR entry unreachable on\ndelete (a permanent leak), and its delete can drop the idr entry of an\nunrelated live auto table. A later auto allocation can then hand out a\nhandle that aliases the live manual table; u32_lookup_ht() first-match\nroutes lookups and TCA_U32_LINK for that htid to the wrong table.\n\nKey the divisor-path alloc on handle2id(handle) so allocation and\nremoval share one key domain. A manual handle that maps onto an id\nalready in use is rejected with -ENOSPC, and auto allocation skips ids\nheld by live manual tables.\n\nConditions to recreate:\n ip link add test0 type dummy\n tc qdisc add dev test0 clsact\n tc filter add dev test0 ingress protocol ip pref 1 \\\n handle 801: u32 divisor 16\n tc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16\n tc -d filter show dev test0 ingress | grep 'fh 801:'\n # unpatched: two live tables with handle 0x80100000 (the pref 2 root\n # hnode is auto-allocated id 1); patched: the auto hnode takes id 2.\n\nAlso tested with a poc with a live u32 table on the block, add/delete a manual\ntable 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with\n-ENOSPC because the raw key leaked on the first delete."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_u32.c"], "versions": [{"version": "9b2c3184e126b941dfa716b8128ed6db92a64e2f", "lessThan": "21fc07924e996e1e661268ca269c86b8d59d25b3", "status": "affected", "versionType": "git"}, {"version": "789f9963bd031c3a185605665b744912df8e7eda", "lessThan": "0fac292d93fdb313099e98cce928b3a524c92c94", "status": "affected", "versionType": "git"}, {"version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "54a454c5e41f5e2cb70c8163140ce095c5d5eefd", "status": "affected", "versionType": "git"}, {"version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "f6696481eedfd5752b4b56eed715d0b0fe48b9c5", "status": "affected", "versionType": "git"}, {"version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "2f898f9ec7c73c5697ee462681e7ea6984ee1f3d", "status": "affected", "versionType": "git"}, {"version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "0a5f5d9e94dead312d32c366b917c64e552b72f7", "status": "affected", "versionType": "git"}, {"version": "4403f9293ce9ecc2a55c688d84ee37e3ba0fc1a8", "status": "affected", "versionType": "git"}, {"version": "6.1.119", "lessThan": "6.1.189", "status": "affected", "versionType": "semver"}, {"version": "6.6.63", "lessThan": "6.6.158", "status": "affected", "versionType": "semver"}, {"version": "6.11.10", "lessThan": "6.12", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_u32.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.1.119", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.63", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/21fc07924e996e1e661268ca269c86b8d59d25b3"}, {"url": "https://git.kernel.org/stable/c/0fac292d93fdb313099e98cce928b3a524c92c94"}, {"url": "https://git.kernel.org/stable/c/54a454c5e41f5e2cb70c8163140ce095c5d5eefd"}, {"url": "https://git.kernel.org/stable/c/f6696481eedfd5752b4b56eed715d0b0fe48b9c5"}, {"url": "https://git.kernel.org/stable/c/2f898f9ec7c73c5697ee462681e7ea6984ee1f3d"}, {"url": "https://git.kernel.org/stable/c/0a5f5d9e94dead312d32c366b917c64e552b72f7"}], "title": "net/sched: cls_u32: fix manual hash table handle IDR aliasing", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/cls_u32.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "21fc07924e996e1e661268ca269c86b8d59d25b3", "status": "affected", "version": "9b2c3184e126b941dfa716b8128ed6db92a64e2f", "versionType": "git"}, {"lessThan": "0fac292d93fdb313099e98cce928b3a524c92c94", "status": "affected", "version": "789f9963bd031c3a185605665b744912df8e7eda", "versionType": "git"}, {"lessThan": "54a454c5e41f5e2cb70c8163140ce095c5d5eefd", "status": "affected", "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "versionType": "git"}, {"lessThan": "f6696481eedfd5752b4b56eed715d0b0fe48b9c5", "status": "affected", "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "versionType": "git"}, {"lessThan": "2f898f9ec7c73c5697ee462681e7ea6984ee1f3d", "status": "affected", "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "versionType": "git"}, {"lessThan": "0a5f5d9e94dead312d32c366b917c64e552b72f7", "status": "affected", "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "versionType": "git"}, {"status": "affected", "version": "4403f9293ce9ecc2a55c688d84ee37e3ba0fc1a8", "versionType": "git"}, {"lessThan": "6.1.189", "status": "affected", "version": "6.1.119", "versionType": "semver"}, {"lessThan": "6.6.158", "status": "affected", "version": "6.6.63", "versionType": "semver"}, {"lessThan": "6.12", "status": "affected", "version": "6.11.10", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sched/cls_u32.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.55", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nnet/sched: cls_u32: fix manual hash table handle IDR aliasing\n\nA u32 hash table created with an explicit handle ('tc filter add ...\nhandle 801: u32 divisor N') keys its IDR entry on the raw handle, while\nthe destroy paths free it under handle2id(handle). The two key domains\ndisagree for handles in the 0x800..0xFFF htid range:\nhandle2id() folds them back into the auto-allocated id space (1..0x7FF).\n\nA manual table therefore leaves its raw-keyed IDR entry unreachable on\ndelete (a permanent leak), and its delete can drop the idr entry of an\nunrelated live auto table. A later auto allocation can then hand out a\nhandle that aliases the live manual table; u32_lookup_ht() first-match\nroutes lookups and TCA_U32_LINK for that htid to the wrong table.\n\nKey the divisor-path alloc on handle2id(handle) so allocation and\nremoval share one key domain. A manual handle that maps onto an id\nalready in use is rejected with -ENOSPC, and auto allocation skips ids\nheld by live manual tables.\n\nConditions to recreate:\n ip link add test0 type dummy\n tc qdisc add dev test0 clsact\n tc filter add dev test0 ingress protocol ip pref 1 \\\n handle 801: u32 divisor 16\n tc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16\n tc -d filter show dev test0 ingress | grep 'fh 801:'\n # unpatched: two live tables with handle 0x80100000 (the pref 2 root\n # hnode is auto-allocated id 1); patched: the auto hnode takes id 2.\n\nAlso tested with a poc with a live u32 table on the block, add/delete a manual\ntable 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with\n-ENOSPC because the raw key leaked on the first delete."}], "id": "CVE-2026-98629", "lastModified": "2026-10-19T10:19:27.130", "metrics": {}, "published": "2026-10-18T16:17:15.960", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0a5f5d9e94dead312d32c366b917c64e552b72f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0fac292d93fdb313099e98cce928b3a524c92c94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/21fc07924e996e1e661268ca269c86b8d59d25b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2f898f9ec7c73c5697ee462681e7ea6984ee1f3d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/54a454c5e41f5e2cb70c8163140ce095c5d5eefd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6696481eedfd5752b4b56eed715d0b0fe48b9c5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/sched: cls_u32: fix manual hash table handle IDR aliasing", "id": "2554917", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554917"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-694", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: cls_u32: fix manual hash table handle IDR aliasing\nA u32 hash table created with an explicit handle ('tc filter add ...\nhandle 801: u32 divisor N') keys its IDR entry on the raw handle, while\nthe destroy paths free it under handle2id(handle). The two key domains\ndisagree for handles in the 0x800..0xFFF htid range:\nhandle2id() folds them back into the auto-allocated id space (1..0x7FF).\nA manual table therefore leaves its raw-keyed IDR entry unreachable on\ndelete (a permanent leak), and its delete can drop the idr entry of an\nunrelated live auto table. A later auto allocation can then hand out a\nhandle that aliases the live manual table; u32_lookup_ht() first-match\nroutes lookups and TCA_U32_LINK for that htid to the wrong table.\nKey the divisor-path alloc on handle2id(handle) so allocation and\nremoval share one key domain. A manual handle that maps onto an id\nalready in use is rejected with -ENOSPC, and auto allocation skips ids\nheld by live manual tables.\nConditions to recreate:\nip link add test0 type dummy\ntc qdisc add dev test0 clsact\ntc filter add dev test0 ingress protocol ip pref 1 \\\nhandle 801: u32 divisor 16\ntc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16\ntc -d filter show dev test0 ingress | grep 'fh 801:'\n# unpatched: two live tables with handle 0x80100000 (the pref 2 root\n# hnode is auto-allocated id 1); patched: the auto hnode takes id 2.\nAlso tested with a poc with a live u32 table on the block, add/delete a manual\ntable 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with\n-ENOSPC because the raw key leaked on the first delete.", "A flaw was found in the Linux kernel's u32 traffic control classifier (cls_u32). A local user with network administration privileges can trigger this flaw by creating and removing filter hash tables with manually assigned handles. Due to an identifier mismatch between table creation and deletion paths, deleting a manual table can leak identifier entries or inadvertently unregister an unrelated active table. This can cause newly allocated tables to alias existing ones, resulting in traffic being routed to incorrect filters and a denial of service (DoS)."], "name": "CVE-2026-98629", "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": "Out of support scope", "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": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98629\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98629\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98629.mbox"], "threat_severity": "Low"}