CVE-2026-68125 (GCVE-0-2026-68125)
Vulnerability from cvelistv5
Published
2026-08-10 11:58
Modified
2026-10-19 20:58
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: reject frames shorter than the authentication tag llsec_do_decrypt_auth() computes the associated-data length for the AEAD request as assoclen += datalen - authlen; where datalen is the number of bytes after the MAC header and authlen (4, 8 or 16) is the length of the authentication tag. Nothing verifies that the frame actually carries at least authlen payload bytes. A secured frame whose payload is shorter than the tag makes datalen - authlen negative; assoclen is then passed to aead_request_set_ad() as an unsigned value close to 4 GiB, so crypto_aead_decrypt() walks far off the end of the scatterlist that only spans the real frame. The frame is fully attacker-controlled and reaches this path from any IEEE 802.15.4 peer in radio range. Reject frames whose payload is shorter than the authentication tag before the subtraction. Dynamically reproduced on a KASAN kernel as a general-protection-fault in the AEAD scatterwalk, and the fix confirmed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
Version: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:29:39.507Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68125\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:52.090Z\", \"dateReserved\": \"2026-07-30T09:28:09.369Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T11:58:46.198Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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