CVE-2026-98301

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: move switchdev call outside rcu This is a follow-up of one of sashiko's pre-existing bug reports. br_mst_set_state() calls switchdev_port_attr_set() for nonzero MSTIs while holding rcu_read_lock() which invokes the blocking switchdev notifier chain and may sleep. Nonzero MSTI changes come from netlink with rtnl held. Move the switchdev call before entering the rcu section and assert that rtnl is held. The call cannot be deferred because netlink needs its error and extack. Also DSA reads the old bridge MST state during the callback and checks it. A deferred callback will be late and will see the updated state.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-06 09:18:21.037000

Last modified

2026-10-19 10:18:32.027000

View original CVE JSON

{
  "id": "CVE-2026-98301",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-06T09:18:21.037",
  "lastModified": "2026-10-19T10:18:32.027",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mst: move switchdev call outside rcu\n\nThis is a follow-up of one of sashiko's pre-existing bug reports.\nbr_mst_set_state() calls switchdev_port_attr_set() for nonzero MSTIs\nwhile holding rcu_read_lock() which invokes the blocking switchdev\nnotifier chain and may sleep. Nonzero MSTI changes come from netlink\nwith rtnl held. Move the switchdev call before entering the rcu section and\nassert that rtnl is held.\n\nThe call cannot be deferred because netlink needs its error and extack.\nAlso DSA reads the old bridge MST state during the callback and checks it.\nA deferred callback will be late and will see the updated state."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/bridge/br_mst.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "8ca9a750fc711911ef616ceb627d07357b04545e",
              "lessThan": "b9661fd2423fc25e91e0517ecc0b6156ad83e3a8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4488617e5e995a09abe4d81add5fb165674edb59",
              "lessThan": "6b431b63219853eef4054e2f1cb073d2ca2059b4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3a7c1661ae1383364cd6092d851f5e5da64d476b",
              "lessThan": "abf734d150c61acfdfee102169d0e5d1c482e285",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3a7c1661ae1383364cd6092d851f5e5da64d476b",
              "lessThan": "d5c4ee1fa4e83a12afc051c831936cd8e006cde3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3a7c1661ae1383364cd6092d851f5e5da64d476b",
              "lessThan": "c40ed3e884c8dc0350f26484030438ef24208ff1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3a7c1661ae1383364cd6092d851f5e5da64d476b",
              "lessThan": "18a6fe05fb6e18de29fa90d388bb34044114b3d8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "a2b01e65d9ba8af2bb086d3b7288ca53a07249ac",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e43dd2b1ec746e105b7db5f9ad6ef14685a615a4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.1.93",
              "lessThan": "6.1.189",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.6.33",
              "lessThan": "6.6.158",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.8.12",
              "lessThan": "6.9",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.9.3",
              "lessThan": "6.10",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/bridge/br_mst.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.10",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.10",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.189",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.158",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.112",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.54",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.8",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/18a6fe05fb6e18de29fa90d388bb34044114b3d8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6b431b63219853eef4054e2f1cb073d2ca2059b4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/abf734d150c61acfdfee102169d0e5d1c482e285",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b9661fd2423fc25e91e0517ecc0b6156ad83e3a8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c40ed3e884c8dc0350f26484030438ef24208ff1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d5c4ee1fa4e83a12afc051c831936cd8e006cde3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}