{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43033",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43033"
  ],
  "published": "2026-05-01T14:17:31Z",
  "summary": "crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption\n\nWhen decrypting data that is not in-place (src != dst), there is\nno need to save the high-order sequence bits in dst as it could\nsimply be re-copied from the source.\n\nHowever, the data to be hashed need to be rearranged accordingly.\n\n\nThanks,",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43033"
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      "scenario": "AV:L - The vulnerable out-of-place AEAD decrypt path is reachable by a local process through AF_ALG sockets using authencesn, while normal inbound ESP uses in-place src==dst. This requires local syscall access rather than remote packets directly reaching the bad branch.\nAC:L - The attacker controls the AF_ALG request buffers, associated-data length, operation type, key, and authsize, and no race or hard-to-influence state is required. The fault occurs before ICV verification, so a valid packet/tag is not needed.\nPR:L - AF_ALG socket creation, bind, key setup, and AEAD decrypt do not require CAP_NET_ADMIN or CAP_SYS_ADMIN, but the attacker needs local unprivileged code execution. XFRM state management is privileged, but the lower-privilege AF_ALG path reaches the bug.\nUI:N - No victim action is required once the local attacker runs the AF_ALG syscall sequence. The attacker supplies both input and output buffers directly.\nS:U - The vulnerability is in kernel crypto processing and impacts the same kernel security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bug is a kernel memory-corruption condition from writing ESN high sequence bytes past the intended out-of-place destination; successful exploitation of such corruption could expose arbitrary kernel memory. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The vulnerable code performs an attacker-influenced out-of-bounds write of four bytes before authentication succeeds. Kernel out-of-bounds writes are scored as high integrity impact because they can plausibly be shaped into control-flow or data corruption.\nA:H - At minimum, the AF_ALG path can drive scatterwalk past the end of the destination scatterlist and crash the kernel. A local attacker can repeat the trigger without authentication, causing high availability impact."
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}