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bridge: br_nd_send: validate ND option lengths

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

Announced Source revision 1
Original source ↗

CVE-2026-31752

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-2026-31752

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": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "82a42eceec7c6bdb0e0da94c0542a173b7ea57f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "259466f76f5a2148aff11134e68f4b4c6d52725b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "c49b9256bbacb6a135654aebd12e4c0e87166b7c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "837392a38445729c22e03d3abcf33f07763efd85",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "e71303a9190496136e240c4f2872b7b0b16027a7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "850837965af15707fd3142c1cf3c5bfaf022299b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bridge/br_arp_nd_proxy.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.134",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.22",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bridge/br_arp_nd_proxy.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31752

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28320 · Revision 1
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Publisher date
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