CVE-2026-80890None▾ SunlitIn 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 broad…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f6e3cc296372accad4ee57405195021231ef4bcbLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c151daba0ceb1fb068a215b07de89fb1eb5f87bcLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 817cffdbdbdf50e1f2b016599d1897de3ca54964Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 61baa5020b0afb41bfd97f8f6ce5e336c4a4546eLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c68557a49e960dbcdede22c7a9b488603078b8b4Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a0d1693923f41d6f49083aa2446686aed09d1d79Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 35c279113498d19a8734e2aae67b951b9b20f634Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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