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CVE-2026-98301

Estado: RecibidaSin puntuar—

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.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-98301",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "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",
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              "versionType": "git"
            },
            {
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            },
            {
              "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-rc4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bridge/br_mst.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-06T09:18:21.037",
  "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"
    }
  ],
  "vulnStatus": "Received",
  "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."
    }
  ],
  "lastModified": "2026-10-06T09:18:21.037",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}