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Critical

bridge: br_nd_send: linearize skb before parsing ND options

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.

Announced Source revision 1
Original source ↗

CVE-2026-31682

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-2026-31682

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": "c68433fd291c9e88c00292095172c62d1997d662",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "4f397b950c916e9a1f8a4fce04ea0110206cad47",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "bd91ec85aa4c77d645bd2739fc56784157a88ca2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "658261898130da620fc3d0fbb0523efb3366cb55",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "2ba4caba423ed94d63006eb1d2227b0332ab7fcd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "9c55e41c73af5c4511070933b1bd25248521270c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "3a30f6469b058574f49efde61cd6f5d79e576053",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed842faeb2bd49256f00485402f3113205f91d30",
        "lessThan": "a01aee7cafc575bb82f5529e8734e7052f9b16ea",
        "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-2026-31682

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#39957 · Revision 1
Added to Heist Feed
Publisher date
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