CVE-2026-98881 (GCVE-0-2026-98881)

Vulnerability from cvelistv5 – Published: 2026-10-23 11:37 – Updated: 2026-10-23 11:37
VLAI
Title
net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: remove stale rcu_barrier() in br_multicast_dev_del() This rcu_barrier() came from a time call_rcu() calls were used in net/bridge/br_multicast.c. Now kfree_rcu() is there, we can remove this problematic rcu_barrier() which causes extreme RTNL pressure in many syzbot reports. INFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537. task:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2 task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337 Workqueue: netns cleanup_net Call Trace: <TASK> [<ffffffff81914eaa>] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483 [<ffffffff81201143>] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411 [<ffffffff8120446b>] __schedule_loop kernel/sched/core.c:8514 [inline] [<ffffffff8120446b>] schedule+0xab/0x260 kernel/sched/core.c:8529 [<ffffffff8121a093>] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75 [<ffffffff81205347>] do_wait_for_common kernel/sched/completion.c:100 [inline] [<ffffffff81205347>] __wait_for_common kernel/sched/completion.c:121 [inline] [<ffffffff81205347>] wait_for_common kernel/sched/completion.c:132 [inline] [<ffffffff81205347>] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153 [<ffffffff81b8f27f>] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888 [<ffffffff860091b3>] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459 [<ffffffff85fb5dbc>] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157 [<ffffffff8568058c>] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599 [<ffffffff8562be43>] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline] [<ffffffff8562be43>] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 35f9f11740515a10b084adfb1ce691351f2452ab (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0443f6aac6bf6a91e406273fdda11497cef6ad07 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ac0e823a228f94ad9d7a3d876cc07e59a7afb806 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f0018acf0b66f93a292667c9a9c2a26c570cf270 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 372ee8fbe0f796031c60f676ec90f0788c26523d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 39679927fa7aaf4601119f7234342d1b5d4f6f84 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 25ae123db10ba9ab890b56bcdb0a4363aee8529a (git)
Affected: 0 , < 5.10.271 (semver)
Affected: 0 , < 5.15.222 (semver)
Affected: 0 , < 6.1.189 (semver)
Affected: 0 , < 6.6.158 (semver)
Affected: 0 , < 6.12.111 (semver)
Affected: 0 , < 6.18.53 (semver)
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Linux Linux Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "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 \u003cTASK\u003e\n  [\u003cffffffff81914eaa\u003e] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n  [\u003cffffffff81201143\u003e] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n  [\u003cffffffff8120446b\u003e] __schedule_loop kernel/sched/core.c:8514 [inline]\n  [\u003cffffffff8120446b\u003e] schedule+0xab/0x260 kernel/sched/core.c:8529\n  [\u003cffffffff8121a093\u003e] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n  [\u003cffffffff81205347\u003e] do_wait_for_common kernel/sched/completion.c:100 [inline]\n  [\u003cffffffff81205347\u003e] __wait_for_common kernel/sched/completion.c:121 [inline]\n  [\u003cffffffff81205347\u003e] wait_for_common kernel/sched/completion.c:132 [inline]\n  [\u003cffffffff81205347\u003e] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n  [\u003cffffffff81b8f27f\u003e] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n  [\u003cffffffff860091b3\u003e] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n  [\u003cffffffff85fb5dbc\u003e] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n  [\u003cffffffff8568058c\u003e] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n  [\u003cffffffff8562be43\u003e] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  [\u003cffffffff8562be43\u003e] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-23T11:37:32.327Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/35f9f11740515a10b084adfb1ce691351f2452ab"
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        {
          "url": "https://git.kernel.org/stable/c/0443f6aac6bf6a91e406273fdda11497cef6ad07"
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          "url": "https://git.kernel.org/stable/c/ac0e823a228f94ad9d7a3d876cc07e59a7afb806"
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        {
          "url": "https://git.kernel.org/stable/c/25ae123db10ba9ab890b56bcdb0a4363aee8529a"
        }
      ],
      "title": "net: bridge: remove stale rcu_barrier() in br_multicast_dev_del()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98881",
    "datePublished": "2026-10-23T11:37:32.327Z",
    "dateReserved": "2026-09-25T10:25:14.378Z",
    "dateUpdated": "2026-10-23T11:37:32.327Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
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            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/bridge/br_multicast.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
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                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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        ],
        "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 \u003cTASK\u003e\n  [\u003cffffffff81914eaa\u003e] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483\n  [\u003cffffffff81201143\u003e] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411\n  [\u003cffffffff8120446b\u003e] __schedule_loop kernel/sched/core.c:8514 [inline]\n  [\u003cffffffff8120446b\u003e] schedule+0xab/0x260 kernel/sched/core.c:8529\n  [\u003cffffffff8121a093\u003e] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75\n  [\u003cffffffff81205347\u003e] do_wait_for_common kernel/sched/completion.c:100 [inline]\n  [\u003cffffffff81205347\u003e] __wait_for_common kernel/sched/completion.c:121 [inline]\n  [\u003cffffffff81205347\u003e] wait_for_common kernel/sched/completion.c:132 [inline]\n  [\u003cffffffff81205347\u003e] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153\n  [\u003cffffffff81b8f27f\u003e] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888\n  [\u003cffffffff860091b3\u003e] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459\n  [\u003cffffffff85fb5dbc\u003e] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157\n  [\u003cffffffff8568058c\u003e] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599\n  [\u003cffffffff8562be43\u003e] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n  [\u003cffffffff8562be43\u003e] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248"
          }
        ],
        "id": "CVE-2026-98881",
        "lastModified": "2026-10-23T12:18:21.670",
        "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"
      }
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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