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CVE-2026-74581

Unknown

Last modified

CVE-2026-74581 is a vulnerability of currently unknown severity. 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..

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 209d35ee34e25f9668c404350a1c86d914c54ffa, < 90c57310e266eb94e4a80d6b15a9ca131d2e82cb; >= 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383, < 5d29b286c9de0b309e94b9ed083aa1a2f429434f; >= cdef485217d30382f3bf6448c54b4401648fe3f1, < 354db6243eca59e9d187ffbf8b7955b044ce84dc; >= cdef485217d30382f3bf6448c54b4401648fe3f1, < 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa; >= cdef485217d30382f3bf6448c54b4401648fe3f1, < 9bad152c42b37499162367fe47867411e62fffa3; >= cdef485217d30382f3bf6448c54b4401648fe3f1, < dc3ab04220667f254f4348572b2a0b3febff89fb; >= cdef485217d30382f3bf6448c54b4401648fe3f1, < a341c091ca0bfae377747b1b59a3bd8ebe18a937; >= cdef485217d30382f3bf6448c54b4401648fe3f1, < 6aea62e433fe1b586202a5fee8b5807ce635e1d7; ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29; >= 5.10.84, < 5.10.265; >= 5.15.7, < 5.15.216; >= 5.4.164, < 5.5
LinuxLinux5.16

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74581?
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.
How severe is CVE-2026-74581?
Severity scoring for CVE-2026-74581 is pending analysis.
How do I fix CVE-2026-74581?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST