CVE-2026-80890 is a vulnerability in Linux Kernel
Published on September 4, 2026
sctp: reject stale cookies with mismatched verification tags
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.
Products Associated with CVE-2026-80890
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below f6e3cc296372accad4ee57405195021231ef4bcb is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c151daba0ceb1fb068a215b07de89fb1eb5f87bc is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 817cffdbdbdf50e1f2b016599d1897de3ca54964 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c68557a49e960dbcdede22c7a9b488603078b8b4 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a0d1693923f41d6f49083aa2446686aed09d1d79 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 35c279113498d19a8734e2aae67b951b9b20f634 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587 is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 5.10.265, <= 5.10.* is unaffected.
- Version 5.15.216, <= 5.15.* is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.