{"id":"CVE-2026-68125","state":"PUBLISHED","title":"mac802154: llsec: reject frames shorter than the authentication tag","description":"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.","publishedAt":"2026-08-10T11:58:46.198Z","updatedAt":"2026-10-19T20:58:52.090Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"f27ce82eb04960465df71634b196a48a4ecafd50","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"2d6b42a61373144298070668fddf06efe79cf2ff","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"ec7e62d77193131227df49d654d118fdf5a59892","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"5bbf0cd9b6a7076af86c75e87e180099be2e11ae","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"de80808f37d99c6dc67bb6f97eea00c8f57a8821","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"f20dedce0429b293d4bad604e0d3f65d8ac96c83","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"e09e0301d616c1ef38a5e64e8e4326fd39df13cc","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"fd3a3f28ed60c6af4b2a39933b151d6b27842c3b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac802154/llsec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac802154/llsec.c"]}],"references":["https://git.kernel.org/stable/c/f27ce82eb04960465df71634b196a48a4ecafd50","https://git.kernel.org/stable/c/2d6b42a61373144298070668fddf06efe79cf2ff","https://git.kernel.org/stable/c/ec7e62d77193131227df49d654d118fdf5a59892","https://git.kernel.org/stable/c/5bbf0cd9b6a7076af86c75e87e180099be2e11ae","https://git.kernel.org/stable/c/de80808f37d99c6dc67bb6f97eea00c8f57a8821","https://git.kernel.org/stable/c/f20dedce0429b293d4bad604e0d3f65d8ac96c83","https://git.kernel.org/stable/c/e09e0301d616c1ef38a5e64e8e4326fd39df13cc","https://git.kernel.org/stable/c/fd3a3f28ed60c6af4b2a39933b151d6b27842c3b"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68125.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68125","state":"PUBLISHED","datePublished":"2026-08-10T11:58:46.198Z","dateUpdated":"2026-10-19T20:58:52.090Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.369Z"},"containers":{"cna":{"title":"mac802154: llsec: reject frames shorter than the authentication tag","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"f27ce82eb04960465df71634b196a48a4ecafd50","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"2d6b42a61373144298070668fddf06efe79cf2ff","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"ec7e62d77193131227df49d654d118fdf5a59892","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"5bbf0cd9b6a7076af86c75e87e180099be2e11ae","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"de80808f37d99c6dc67bb6f97eea00c8f57a8821","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"f20dedce0429b293d4bad604e0d3f65d8ac96c83","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"e09e0301d616c1ef38a5e64e8e4326fd39df13cc","versionType":"git"},{"version":"4c14a2fb5d143e4ed94143be2b8c1961b47df9af","status":"affected","lessThan":"fd3a3f28ed60c6af4b2a39933b151d6b27842c3b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac802154/llsec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac802154/llsec.c"]}],"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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - Exploitation requires sending crafted IEEE 802.15.4 frames over the WPAN radio interface; any peer within RF range can reach mac802154 receive/decrypt without IP routing or local shell access, matching Adjacent wireless attack guidance like Bluetooth.\nAC:L - The attacker fully controls frame length and security header fields; once LLSEC is enabled on the victim, a single undersized MIC-only secured frame reliably triggers the assoclen underflow and was dynamically reproduced as a KASAN GPF.\nPR:N - No Linux credentials or capabilities are required on the target; exploitation is performed by an over-the-air 802.15.4 peer spoofing a known PAN device/key/frame counter, not via local syscalls, ioctl, or netlink.\nUI:N - No victim user action is needed beyond normal operation of an LLSEC-enabled 802.15.4 interface; the malicious frame is processed automatically in the softirq receive path before delivery to userspace.\nS:U - Impact is confined to kernel memory and availability on the attacked host's WPAN stack; it does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The wrapped assoclen makes crypto_aead_decrypt() scatterwalk read gigabytes beyond the skb-backed scatterlist, causing out-of-bounds kernel memory reads that can disclose adjacent heap or slab data and enable further exploitation primitives.\nI:H - Kernel memory corruption in the AEAD decrypt scatterwalk path can be leveraged for control-flow hijack or arbitrary write primitives beyond the demonstrated crash, consistent with high integrity impact for exploitable OOB access in crypto handlers.\nA:H - The bug was reproduced on a KASAN kernel as a general-protection fault in the AEAD scatterwalk, and repeated malicious frames can panic or hang the kernel on LLSEC-enabled coordinators, gateways, and IoT border routers."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:29:39.507Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-68125","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:44:15.964200Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","type":"CWE","description":"CWE-190 Integer Overflow or Wraparound"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:58:52.090Z"}}]}}}