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net: bridge: mst: move switchdev call outside rcu

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98301

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98301

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "net/bridge/br_mst.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bridge/br_mst.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98301

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38378 · Revision 1
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Publisher date
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