CVE-2026-80890 (GCVE-0-2026-80890)
Vulnerability from cvelistv5
Published
2026-09-04 17:11
Modified
2026-09-04 17:11
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "programFiles": [
            "net/sctp/sm_make_chunk.c"
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      "cpeApplicability": [
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              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T17:11:06.742Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f6e3cc296372accad4ee57405195021231ef4bcb"
        },
        {
          "url": "https://git.kernel.org/stable/c/c151daba0ceb1fb068a215b07de89fb1eb5f87bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/817cffdbdbdf50e1f2b016599d1897de3ca54964"
        },
        {
          "url": "https://git.kernel.org/stable/c/61baa5020b0afb41bfd97f8f6ce5e336c4a4546e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c68557a49e960dbcdede22c7a9b488603078b8b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0d1693923f41d6f49083aa2446686aed09d1d79"
        },
        {
          "url": "https://git.kernel.org/stable/c/35c279113498d19a8734e2aae67b951b9b20f634"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d8da8e0a9bce4a340af60dd0446bc7eb8d07587"
        }
      ],
      "title": "sctp: reject stale cookies with mismatched verification tags",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80890",
    "datePublished": "2026-09-04T17:11:06.742Z",
    "dateReserved": "2026-08-26T14:34:25.799Z",
    "dateUpdated": "2026-09-04T17:11:06.742Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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