CVE-2026-80890
Vulnerability Scoring
Analysis In Progress
CVE-2026-80890 Vulnerability Analysis & Exploit Details
CVE-2026-80890
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-80890 Details
Status: Received on 04 Sep 2026, 18:17 UTC
Published on: 04 Sep 2026, 18:17 UTC
CVSS Release:
CVE-2026-80890 Vulnerability Summary
CVE-2026-80890: 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.
Assessing the Risk of CVE-2026-80890
Access Complexity Graph
The exploitability of CVE-2026-80890 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-80890
No exploitability data is available for CVE-2026-80890.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-80890, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-80890, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-80890 does not compromise confidentiality.
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Integrity:
None
CVE-2026-80890 does not impact data integrity.
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Availability:
None
CVE-2026-80890 does not affect system availability.
CVE-2026-80890 References
External References
- 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
CWE Common Weakness Enumeration
Unknown
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