Answer in brief
CVE-2026-80890 records a Unknown severity vulnerability in sctp: reject stale cookies with mismatched verification tags. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6e3cc296372accad4ee57405195021231ef4bcb || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c151daba0ceb1fb068a215b07de89fb1eb5f87bc || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <817cffdbdbdf50e1f2b016599d1897de3ca54964 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61baa5020b0afb41bfd97f8f6ce5e336c4a4546e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c68557a49e960dbcdede22c7a9b488603078b8b4 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0d1693923f41d6f49083aa2446686aed09d1d79 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35c279113498d19a8734e2aae67b951b9b20f634 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9d8da8e0a9bce4a340af60dd0446bc7eb8d07587 | f6e3cc296372accad4ee57405195021231ef4bcb, c151daba0ceb1fb068a215b07de89fb1eb5f87bc, 817cffdbdbdf50e1f2b016599d1897de3ca54964, 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e, c68557a49e960dbcdede22c7a9b488603078b8b4, a0d1693923f41d6f49083aa2446686aed09d1d79, 35c279113498d19a8734e2aae67b951b9b20f634, 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.