CVE-2026-97940ipv6: fix fib6 walker UAF on seq stop
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix fib6 walker UAF on seq stop ipv6_route_iter_active() treats a walker in FWS_U at the table root as already unlinked. fib6_del_route() can move a still-linked walker into that same state when the current leaf is the last route at the root, so ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq private object can then be freed while it remains on net->ipv6.fib6_walkers. A later route deletion walks the dangling list and uses the freed walker. Use the list head as membership state and reinitialize it when unlinking. Keep the existing w->node check so a never-started iterator with a zeroed private object is not treated as linked. The same stop helper is used by /proc/net/ipv6_route and by the BPF ipv6_route iterator. The BPF show path only widens the race.
Timeline
ID reserved
By Linux
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 9a3f73d62c86271614eda4c43315230896a37018
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 63407cddabc5992b5ac03af165559f4a1968a032
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 05b687ee04f816658f4a9cf586f4d2f129157943
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 14fdaba201fdff92a3e45994e02bccda409cb19d
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 0eede1689610e9eeaf729ba86fd1321799eb91a0
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < b89b691dd00bf39b9ba39ab9446f8c62f419fa7b
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02
- affected 8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 – < 19b4ed644d68098cc62ab612727f40d30f43476c
- affected 3.13
- unaffected < 3.13
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/9a3f73d62c86271614eda4c43315230896a37018 (opens in a new tab)
- https://git.kernel.org/stable/c/63407cddabc5992b5ac03af165559f4a1968a032 (opens in a new tab)
- https://git.kernel.org/stable/c/05b687ee04f816658f4a9cf586f4d2f129157943 (opens in a new tab)
- https://git.kernel.org/stable/c/14fdaba201fdff92a3e45994e02bccda409cb19d (opens in a new tab)
- https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0 (opens in a new tab)
- https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b (opens in a new tab)
- https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02 (opens in a new tab)
- https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86794 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-97940)Record last updated .