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net: bridge: use option bits for CFM/MRP frame handlers

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: bridge: use option bits for CFM/MRP frame handlers CFM and MRP register a global br_frame_type whose hlist_node is linked into the per-bridge frame_type_list when the first MEP/MRP instance is created. Enabling the protocol on multiple bridges therefore inserts the same node into multiple lists. Unregistering it on one bridge then corrupts list state belonging to another. These handlers can only be installed once per bridge, and they are uncommon. Track their per-bridge enable state with net_bridge option bits, which already live on the Rx hot cache line, and dispatch the matching handler directly from the receive path. Check both bits together first as an unlikely case. Remove the generic frame_type_list and br_frame_type helpers, which have had no other users since CFM and MRP were added. That shrinks struct net_bridge by 8 bytes and drops the list walk from the fast path. When neither protocol is compiled in, BR_CFM_MRP_OPTS is 0 and the compiler prunes the branch.

Announced Source revision 1
Original source ↗

CVE-2026-97615

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-2026-97615

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": "90c628dd47ff4178f645b34938470bf43d02d123",
        "lessThan": "260f99b355a44f6ce67971ebc9223b22c8f93957",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90c628dd47ff4178f645b34938470bf43d02d123",
        "lessThan": "be5ead6552418d70df3a76b962ccd6ed78a31fb5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90c628dd47ff4178f645b34938470bf43d02d123",
        "lessThan": "994fd705ca498223d188024cde833739a9dddbd2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90c628dd47ff4178f645b34938470bf43d02d123",
        "lessThan": "42e033c8f30fd2923ccac3373ae70797e521dae1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90c628dd47ff4178f645b34938470bf43d02d123",
        "lessThan": "7a49e6b16f36b8e085521699adbca3e321b6dd0c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bridge/br_cfm.c",
      "net/bridge/br_device.c",
      "net/bridge/br_input.c",
      "net/bridge/br_mrp.c",
      "net/bridge/br_private.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bridge/br_cfm.c",
      "net/bridge/br_device.c",
      "net/bridge/br_input.c",
      "net/bridge/br_mrp.c",
      "net/bridge/br_private.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97615

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48795 · Revision 1
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Publisher date
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