net: ipv6: clear suppressed fib6 rule result

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Summary

CVECVE-2026-74581
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-21 17:16:44 UTC
Updated2026-08-21 17:16:44 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 209d35ee34e25f9668c404350a1c86d914c54ffa 90c57310e266eb94e4a80d6b15a9ca131d2e82cb git Not specified
CNA Linux Linux affected 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 5d29b286c9de0b309e94b9ed083aa1a2f429434f git Not specified
CNA Linux Linux affected cdef485217d30382f3bf6448c54b4401648fe3f1 354db6243eca59e9d187ffbf8b7955b044ce84dc git Not specified
CNA Linux Linux affected cdef485217d30382f3bf6448c54b4401648fe3f1 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa git Not specified
CNA Linux Linux affected cdef485217d30382f3bf6448c54b4401648fe3f1 9bad152c42b37499162367fe47867411e62fffa3 git Not specified
CNA Linux Linux affected cdef485217d30382f3bf6448c54b4401648fe3f1 dc3ab04220667f254f4348572b2a0b3febff89fb git Not specified
CNA Linux Linux affected cdef485217d30382f3bf6448c54b4401648fe3f1 a341c091ca0bfae377747b1b59a3bd8ebe18a937 git Not specified
CNA Linux Linux affected cdef485217d30382f3bf6448c54b4401648fe3f1 6aea62e433fe1b586202a5fee8b5807ce635e1d7 git Not specified
CNA Linux Linux affected ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29 git Not specified
CNA Linux Linux affected 5.10.84 5.10.265 semver Not specified
CNA Linux Linux affected 5.15.7 5.15.216 semver Not specified
CNA Linux Linux affected 5.4.164 5.5 semver Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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