{"id":"CVE-2026-68125","summary":"mac802154: llsec: reject frames shorter than the authentication tag","details":"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 += 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.","modified":"2026-08-12T04:18:45.900170551Z","published":"2026-08-10T11:58:46.198Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68125.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5bbf0cd9b6a7076af86c75e87e180099be2e11ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de80808f37d99c6dc67bb6f97eea00c8f57a8821"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e09e0301d616c1ef38a5e64e8e4326fd39df13cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f20dedce0429b293d4bad604e0d3f65d8ac96c83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd3a3f28ed60c6af4b2a39933b151d6b27842c3b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68125.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68125"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af"},{"fixed":"5bbf0cd9b6a7076af86c75e87e180099be2e11ae"},{"fixed":"de80808f37d99c6dc67bb6f97eea00c8f57a8821"},{"fixed":"f20dedce0429b293d4bad604e0d3f65d8ac96c83"},{"fixed":"e09e0301d616c1ef38a5e64e8e4326fd39df13cc"},{"fixed":"fd3a3f28ed60c6af4b2a39933b151d6b27842c3b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68125.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.16.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68125.json"}}],"schema_version":"1.9.0"}