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net: ipv6: clear suppressed fib6 rule result

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info. If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release(). Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.

Announced Source revision 1
Original source ↗

CVE-2026-74581

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-2026-74581

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": "209d35ee34e25f9668c404350a1c86d914c54ffa",
        "lessThan": "90c57310e266eb94e4a80d6b15a9ca131d2e82cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383",
        "lessThan": "5d29b286c9de0b309e94b9ed083aa1a2f429434f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdef485217d30382f3bf6448c54b4401648fe3f1",
        "lessThan": "354db6243eca59e9d187ffbf8b7955b044ce84dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdef485217d30382f3bf6448c54b4401648fe3f1",
        "lessThan": "6d98c70fe0ba8c7708bfd5b2a5174d2086775daa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdef485217d30382f3bf6448c54b4401648fe3f1",
        "lessThan": "9bad152c42b37499162367fe47867411e62fffa3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdef485217d30382f3bf6448c54b4401648fe3f1",
        "lessThan": "dc3ab04220667f254f4348572b2a0b3febff89fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdef485217d30382f3bf6448c54b4401648fe3f1",
        "lessThan": "a341c091ca0bfae377747b1b59a3bd8ebe18a937",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cdef485217d30382f3bf6448c54b4401648fe3f1",
        "lessThan": "6aea62e433fe1b586202a5fee8b5807ce635e1d7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.84",
        "lessThan": "5.10.265",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.7",
        "lessThan": "5.15.216",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.4.164",
        "lessThan": "5.5",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/ipv6/fib6_rules.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/fib6_rules.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74581

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#33219 · Revision 1
Added to Heist Feed
Publisher date
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