net: ipv6: clear suppressed fib6 rule result
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.
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