CVE-2026-98881 (GCVE-0-2026-98881)
Vulnerability from cvelistv5
Published
2026-10-23 11:37
Modified
2026-10-26 06:56
Severity ?
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
Version: 19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T06:56:04.487Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98881",
    "datePublished": "2026-10-23T11:37:32.327Z",
    "dateReserved": "2026-09-25T10:25:14.378Z",
    "dateUpdated": "2026-10-26T06:56:04.487Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.