{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-80890 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-80890 is a vulnerability in Linux, published on 4 Sep 2026."},"fix_prompt":"Check this codebase for CVE-2026-80890 and fix it if it is affected.\n\nWhat it is: CVE-2026-80890 is a vulnerability in Linux, published on 4 Sep 2026. \nExploitation: There is no known exploitation of CVE-2026-80890 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-80890/ (Markdown: https://insights.sbomify.com/CVE-2026-80890/index.md)","id":"CVE-2026-80890","markdown":"https://insights.sbomify.com/CVE-2026-80890/index.md","name":"CVE-2026-80890","record":{"aliases":["AZL-99642","BELL-CVE-2026-80890","DEBIAN-CVE-2026-80890","GHSA-fqw8-ghgv-hjc2","UBUNTU-CVE-2026-80890"],"analysis":null,"analysis_generated_by":null,"assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: reject stale cookies with mismatched verification tags\n\nsctp_unpack_cookie() skips cookie expiration checks whenever an\nassociation already exists.  This is broader than the exception in\nRFC 9260 Section 5.2.4.\n\nFor an existing association, Section 5.2.4 permits an expired State\nCookie only when both Verification Tags in the cookie match the current\nassociation.  Otherwise, the packet SHOULD be discarded and a Stale\nCookie ERROR MUST be sent.\n\nThe broad check lets an expired Action A restart cookie reach\nsctp_sf_do_dupcook_a().  In a runtime test with the default 60 second\ncookie lifetime, replaying such a cookie after 65 seconds returned a\nCOOKIE-ACK and restarted the association.\n\nCheck cookie expiration unless both Verification Tags match.  This\npreserves the Action D exception for a lost COOKIE ACK while rejecting\nexpired cookies in all other cases.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"sctp: reject stale cookies with mismatched verification tags","id":"CVE-2026-80890","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":8,"next":{"headline":"KVM: s390: pci: Validate AIBV and AISB before pinning guest pages","id":"CVE-2026-80891"},"packages":[],"prev":{"headline":"can: isotp: fix timer drain order, wakeup handling and tx_gen ordering","id":"CVE-2026-80889"},"products":["Linux"],"published":"2026-09-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-09-04","vendors":["Linux"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-80890/"}