CVE-2026-74581: net: ipv6: clear suppressed fib6 rule result
Vulnerability summary
CVE-2026-74581 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 36.4% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 37 · Related 20Timeline
- 21-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · Red hatEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
36%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.42% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu165 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Redhat32 products
- bpftool< 0:7.0.0-284.189.1.el9_2 | < 0:4.18.0-372.209.1.el8_6 | < 0:4.18.0-305.202.1.el8_4
- bpftool-debuginfo< 0:7.0.0-284.189.1.el9_2 | < 0:4.18.0-372.209.1.el8_6 | < 0:4.18.0-305.202.1.el8_4
- kernel< 0:5.14.0-284.189.1.el9_2 | < 0:4.18.0-372.209.1.el8_6 | < 0:4.18.0-305.202.1.el8_4
- kernel-64k< 0:5.14.0-284.189.1.el9_2
- kernel-64k-core< 0:5.14.0-284.189.1.el9_2
Debian2 products
- linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
- linux-6.12< 6.12.107-1~deb12u1
Linux1 product
- linux≥ 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 | 5.16
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References
30 linksShow all 30 references
- git.kernel.org/pub/…ARTICLE
