by Kastro CVE-2026-74581
Linux Linux — net: ipv6: clear suppressed fib6 rule result
Description · from the CVE 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.
Affected
ProductAffectedFixed inSource
Linux209d35ee34e25f9668c404350a1c86d914c54ffa – < 90c57310e266eb94e4a80d6b15a9ca131d2e82cb90c57310e266eb94e4a80d6b15a9ca131d2e82cbCNA
Linux8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 – < 5d29b286c9de0b309e94b9ed083aa1a2f429434f5d29b286c9de0b309e94b9ed083aa1a2f429434fCNA
Linuxcdef485217d30382f3bf6448c54b4401648fe3f1 – < 354db6243eca59e9d187ffbf8b7955b044ce84dc354db6243eca59e9d187ffbf8b7955b044ce84dcCNA
Linuxcdef485217d30382f3bf6448c54b4401648fe3f1 – < 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa6d98c70fe0ba8c7708bfd5b2a5174d2086775daaCNA
Linuxcdef485217d30382f3bf6448c54b4401648fe3f1 – < 9bad152c42b37499162367fe47867411e62fffa39bad152c42b37499162367fe47867411e62fffa3CNA
Linuxcdef485217d30382f3bf6448c54b4401648fe3f1 – < dc3ab04220667f254f4348572b2a0b3febff89fbdc3ab04220667f254f4348572b2a0b3febff89fbCNA
Linuxcdef485217d30382f3bf6448c54b4401648fe3f1 – < a341c091ca0bfae377747b1b59a3bd8ebe18a937a341c091ca0bfae377747b1b59a3bd8ebe18a937CNA
Linuxcdef485217d30382f3bf6448c54b4401648fe3f1 – < 6aea62e433fe1b586202a5fee8b5807ce635e1d76aea62e433fe1b586202a5fee8b5807ce635e1d7CNA
Linuxee38eb8cf9a7323884c2b8e0adbbeb2192d31e29–CNA
Linux5.10.84 – < 5.10.2655.10.265CNA
Linux5.15.7 – < 5.15.2165.15.216CNA
Linux5.4.164 – < 5.55.5CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total