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CVE-2026-74581

net: ipv6: clear suppressed fib6 rule result

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 5.5, 6.1.183, 6.6.151, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 209d35ee34e25f9668c404350a1c86d914c54ffa · fixed in 90c57310e266eb94e4a80d6b15a9ca131d2e82cb; From 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 · fixed in 5d29b286c9de0b309e94b9ed083aa1a2f429434f; From cdef485217d30382f3bf6448c54b4401648fe3f1 · fixed in 354db6243eca59e9d187ffbf8b7955b044ce84dc; From cdef485217d30382f3bf6448c54b4401648fe3f1 · fixed in 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa; From cdef485217d30382f3bf6448c54b4401648fe3f1 · fixed in 9bad152c42b37499162367fe47867411e62fffa3; From cdef485217d30382f3bf6448c54b4401648fe3f1 · fixed in dc3ab04220667f254f4348572b2a0b3febff89fb; From cdef485217d30382f3bf6448c54b4401648fe3f1 · fixed in a341c091ca0bfae377747b1b59a3bd8ebe18a937; From cdef485217d30382f3bf6448c54b4401648fe3f1 · fixed in 6aea62e433fe1b586202a5fee8b5807ce635e1d7; From 5.10.84 · fixed in 5.10.265; From 5.15.7 · fixed in 5.15.216; From 5.4.164 · fixed in 5.5

  • Linux Linux

    5.16

  • KernelLinux

    fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; fixed in 6.6.151; From 6.2.0 · fixed in 6.12.103; From 6.7.0 · fixed in 6.18.44; From 6.13.0 · fixed in 7.1.8

References 8

git.kernel.org