CVE-2026-80890 Affecting kernel6.12-tools package, versions <1:6.12.103-127.188.amzn2023
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2023-KERNEL612TOOLS-19896317
- published18 Sept 2026
- disclosed4 Sept 2026
Introduced: 4 Sep 2026
NewCVE-2026-80890 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel6.12-tools to version 1:6.12.103-127.188.amzn2023 or higher.
This issue was patched in ALAS2023-2026-2110.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel6.12-tools package and not the kernel6.12-tools package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
sctp: reject stale cookies with mismatched verification tags
sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4.
For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association. Otherwise, the packet SHOULD be discarded and a Stale Cookie ERROR MUST be sent.
The broad check lets an expired Action A restart cookie reach sctp_sf_do_dupcook_a(). In a runtime test with the default 60 second cookie lifetime, replaying such a cookie after 65 seconds returned a COOKIE-ACK and restarted the association.
Check cookie expiration unless both Verification Tags match. This preserves the Action D exception for a lost COOKIE ACK while rejecting expired cookies in all other cases.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-80890
- https://git.kernel.org/stable/c/35c279113498d19a8734e2aae67b951b9b20f634
- https://git.kernel.org/stable/c/61baa5020b0afb41bfd97f8f6ce5e336c4a4546e
- https://git.kernel.org/stable/c/817cffdbdbdf50e1f2b016599d1897de3ca54964
- https://git.kernel.org/stable/c/9d8da8e0a9bce4a340af60dd0446bc7eb8d07587
- https://git.kernel.org/stable/c/a0d1693923f41d6f49083aa2446686aed09d1d79
- https://git.kernel.org/stable/c/c151daba0ceb1fb068a215b07de89fb1eb5f87bc
- https://git.kernel.org/stable/c/c68557a49e960dbcdede22c7a9b488603078b8b4
- https://git.kernel.org/stable/c/f6e3cc296372accad4ee57405195021231ef4bcb