{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98881", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.378Z", "datePublished": "2026-10-23T11:37:32.327Z", "dateUpdated": "2026-10-26T06:56:04.487Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-26T06:56:04.487Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: remove stale rcu_barrier() in br_multicast_dev_del()\n\nThis rcu_barrier() came from a time call_rcu() calls were used in\nnet/bridge/br_multicast.c.\n\nNow kfree_rcu() is there, we can remove this problematic rcu_barrier()\nwhich causes extreme RTNL pressure in many syzbot reports.\n\nINFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537.\ntask:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2 task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline]\n [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529\n [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline]\n [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline]\n [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline]\n [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/br_multicast.c"], "versions": [{"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "35f9f11740515a10b084adfb1ce691351f2452ab", "status": "affected", "versionType": "git"}, {"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "0443f6aac6bf6a91e406273fdda11497cef6ad07", "status": "affected", "versionType": "git"}, {"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "ac0e823a228f94ad9d7a3d876cc07e59a7afb806", "status": "affected", "versionType": "git"}, {"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "f0018acf0b66f93a292667c9a9c2a26c570cf270", "status": "affected", "versionType": "git"}, {"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "372ee8fbe0f796031c60f676ec90f0788c26523d", "status": "affected", "versionType": "git"}, {"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "39679927fa7aaf4601119f7234342d1b5d4f6f84", "status": "affected", "versionType": "git"}, {"version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "lessThan": "25ae123db10ba9ab890b56bcdb0a4363aee8529a", "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/bridge/br_multicast.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "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": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "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": "5.0", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/35f9f11740515a10b084adfb1ce691351f2452ab"}, {"url": "https://git.kernel.org/stable/c/0443f6aac6bf6a91e406273fdda11497cef6ad07"}, {"url": "https://git.kernel.org/stable/c/ac0e823a228f94ad9d7a3d876cc07e59a7afb806"}, {"url": "https://git.kernel.org/stable/c/f0018acf0b66f93a292667c9a9c2a26c570cf270"}, {"url": "https://git.kernel.org/stable/c/372ee8fbe0f796031c60f676ec90f0788c26523d"}, {"url": "https://git.kernel.org/stable/c/39679927fa7aaf4601119f7234342d1b5d4f6f84"}, {"url": "https://git.kernel.org/stable/c/25ae123db10ba9ab890b56bcdb0a4363aee8529a"}], "title": "net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bridge/br_multicast.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "35f9f11740515a10b084adfb1ce691351f2452ab", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}, {"lessThan": "0443f6aac6bf6a91e406273fdda11497cef6ad07", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}, {"lessThan": "ac0e823a228f94ad9d7a3d876cc07e59a7afb806", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}, {"lessThan": "f0018acf0b66f93a292667c9a9c2a26c570cf270", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}, {"lessThan": "372ee8fbe0f796031c60f676ec90f0788c26523d", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}, {"lessThan": "39679927fa7aaf4601119f7234342d1b5d4f6f84", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}, {"lessThan": "25ae123db10ba9ab890b56bcdb0a4363aee8529a", "status": "affected", "version": "19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bridge/br_multicast.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "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": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "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\nnet: bridge: remove stale rcu_barrier() in br_multicast_dev_del()\n\nThis rcu_barrier() came from a time call_rcu() calls were used in\nnet/bridge/br_multicast.c.\n\nNow kfree_rcu() is there, we can remove this problematic rcu_barrier()\nwhich causes extreme RTNL pressure in many syzbot reports.\n\nINFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537.\ntask:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2 task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline]\n [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529\n [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline]\n [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline]\n [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline]\n [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248"}], "id": "CVE-2026-98881", "lastModified": "2026-10-26T07:17:12.987", "metrics": {}, "published": "2026-10-23T12:18:21.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0443f6aac6bf6a91e406273fdda11497cef6ad07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/25ae123db10ba9ab890b56bcdb0a4363aee8529a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35f9f11740515a10b084adfb1ce691351f2452ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/372ee8fbe0f796031c60f676ec90f0788c26523d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/39679927fa7aaf4601119f7234342d1b5d4f6f84"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ac0e823a228f94ad9d7a3d876cc07e59a7afb806"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f0018acf0b66f93a292667c9a9c2a26c570cf270"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()", "id": "2559547", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559547"}, "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-821", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: bridge: remove stale rcu_barrier() in br_multicast_dev_del()\nThis rcu_barrier() came from a time call_rcu() calls were used in\nnet/bridge/br_multicast.c.\nNow kfree_rcu() is there, we can remove this problematic rcu_barrier()\nwhich causes extreme RTNL pressure in many syzbot reports.\nINFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537.\ntask:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2 task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337\nWorkqueue: netns cleanup_net\nCall Trace:\n<TASK>\n[<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n[<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n[<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline]\n[<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529\n[<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n[<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline]\n[<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline]\n[<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline]\n[<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n[<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n[<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n[<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n[<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n[<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n[<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248", "A flaw was found in the Linux kernel's bridge networking subsystem. An obsolete synchronization call during the deletion of bridge multicast devices causes severe lock contention within the networking layer. A local user could exploit this flaw by repeatedly creating and removing network bridge devices, causing kernel tasks to stall and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-98881", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "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": "2026-10-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98881\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98881\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98881.mbox"], "threat_severity": "Moderate"}