{"id":"CVE-2026-68125","title":"mac802154: llsec: reject frames shorter than the authentication tag","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: llsec: reject frames shorter than the authentication tag\n\nllsec_do_decrypt_auth() computes the associated-data length for the\nAEAD request as\n\n\tassoclen += d…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < f27ce82eb04960465df71634b196a48a4ecafd50","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < 2d6b42a61373144298070668fddf06efe79cf2ff","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < ec7e62d77193131227df49d654d118fdf5a59892","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < 5bbf0cd9b6a7076af86c75e87e180099be2e11ae","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < de80808f37d99c6dc67bb6f97eea00c8f57a8821","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < f20dedce0429b293d4bad604e0d3f65d8ac96c83","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < e09e0301d616c1ef38a5e64e8e4326fd39df13cc","Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < fd3a3f28ed60c6af4b2a39933b151d6b27842c3b","Linux 3.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:44:15.964200Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:58.125Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68125","references":[{"url":"https://git.kernel.org/stable/c/f27ce82eb04960465df71634b196a48a4ecafd50"},{"url":"https://git.kernel.org/stable/c/2d6b42a61373144298070668fddf06efe79cf2ff"},{"url":"https://git.kernel.org/stable/c/ec7e62d77193131227df49d654d118fdf5a59892"},{"url":"https://git.kernel.org/stable/c/5bbf0cd9b6a7076af86c75e87e180099be2e11ae"},{"url":"https://git.kernel.org/stable/c/de80808f37d99c6dc67bb6f97eea00c8f57a8821"},{"url":"https://git.kernel.org/stable/c/f20dedce0429b293d4bad604e0d3f65d8ac96c83"},{"url":"https://git.kernel.org/stable/c/e09e0301d616c1ef38a5e64e8e4326fd39df13cc"},{"url":"https://git.kernel.org/stable/c/fd3a3f28ed60c6af4b2a39933b151d6b27842c3b"}],"tags":["cve.org"],"epss":0.00316,"epssPercentile":0.22953,"ingestedAt":"2026-10-16T17:24:46.840Z","slug":"CVE-2026-68125","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: llsec: reject frames shorter than the authentication tag\n\nllsec_do_decrypt_auth() computes the associated-data length for the\nAEAD request as\n\n\tassoclen += datalen - authlen;\n\nwhere datalen is the number of bytes after the MAC header and authlen\n(4, 8 or 16) is the length of the authentication tag. Nothing verifies\nthat the frame actually carries at least authlen payload bytes. A\nsecured frame whose payload is shorter than the tag makes\ndatalen - authlen negative; assoclen is then passed to\naead_request_set_ad() as an unsigned value close to 4 GiB, so\ncrypto_aead_decrypt() walks far off the end of the scatterlist that\nonly spans the real frame.\n\nThe frame is fully attacker-controlled and reaches this path from any\nIEEE 802.15.4 peer in radio range. Reject frames whose payload is\nshorter than the authentication tag before the subtraction.\n\nDynamically reproduced on a KASAN kernel as a general-protection-fault\nin the AEAD scatterwalk, and the fix confirmed.\n\n## Affected\n\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < f27ce82eb04960465df71634b196a48a4ecafd50`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < 2d6b42a61373144298070668fddf06efe79cf2ff`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < ec7e62d77193131227df49d654d118fdf5a59892`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < 5bbf0cd9b6a7076af86c75e87e180099be2e11ae`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < de80808f37d99c6dc67bb6f97eea00c8f57a8821`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < f20dedce0429b293d4bad604e0d3f65d8ac96c83`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < e09e0301d616c1ef38a5e64e8e4326fd39df13cc`\n- `Linux >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af < fd3a3f28ed60c6af4b2a39933b151d6b27842c3b`\n- `Linux 3.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}