{ "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 \n [] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n [] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n [] __schedule_loop kernel/sched/core.c:8514 [inline]\n [] schedule+0xab/0x260 kernel/sched/core.c:8529\n [] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n [] do_wait_for_common kernel/sched/completion.c:100 [inline]\n [] __wait_for_common kernel/sched/completion.c:121 [inline]\n [] wait_for_common kernel/sched/completion.c:132 [inline]\n [] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n [] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n [] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n [] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n [] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n [] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n [] 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" } } } }