{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31431",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31431"
  ],
  "published": "2026-04-22T08:17:36Z",
  "summary": "crypto: algif_aead - Revert to operating out-of-place",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings.  Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly.",
  "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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  "references": [
    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31431"
    },
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      "url": "https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable algif_aead path is reached through local AF_ALG socket syscalls: socket, bind, setsockopt, accept, sendmsg, and recvmsg. It is not directly reachable from remote network packets.\nAC:L - A local attacker can construct the AF_ALG AEAD request, choose buffer layout, AAD/tag lengths, and invoke recvmsg directly. Any race or SGL layout condition is attacker-controlled from the same process.\nPR:L - Creating and using AF_ALG AEAD sockets requires only an unprivileged local user on systems with CRYPTO_USER_API_AEAD enabled. The traced socket, bind, setsockopt, accept, sendmsg, and recvmsg paths do not require CAP_SYS_ADMIN or other real root privileges.\nUI:N - No victim interaction is needed once the attacker has local code execution. The attacker can open and drive the AF_ALG socket entirely through syscalls.\nS:U - The issue remains within the kernel/user crypto API security authority and does not cross a VM, IOMMU, or separate sandbox boundary. This is a standard local kernel attack surface.\nC:H - The removed in-place AEAD design used user-writable RX scatterlists as crypto source data and chained TX tag pages, creating a plausible decryption/authentication bypass for data protected by secret AEAD keys. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The bug undermines AEAD authenticity by allowing source data used by the crypto operation to diverge from the data originally submitted and authenticated. This can allow forged or corrupted plaintext/ciphertext results, so integrity impact is high.\nA:H - The vulnerable path builds complex chained scatterlists from attacker-controlled local buffers and related AF_ALG fixes show these paths can lead to scatterwalk NULL dereferences and kernel panics. A local attacker can repeatedly trigger the operation, so availability impact is high."
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}