{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b880a80011f56880f32bde47fc6af313359f926b"
            },
            {
              "fixed": "e505092cb200d430d5b8d8d3e926d45f29474ba3"
            },
            {
              "fixed": "d29a8ee271da17b5e32d7a76a9c78d43f66447ca"
            },
            {
              "fixed": "221049874b6a78c7d87bc826581b0695cd338e2b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93266.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: RSI: fix field-spanning write warning in attestation token init\n\nThe challenge is passed in registers a1 through a8. However, copying to\n\u0026regs.a1 makes FORTIFY treat the destination as the single a1 field,\nresulting in a field-spanning write warning. [1]\n\nOverlay the SMCCC register structure with an RSI-specific argument\nlayout and copy the challenge into an explicit 64-byte array. This keeps\nthe existing a1-a8 argument encoding while giving the copy a correctly\nsized destination object.\n\n[1]\nmemcpy: detected field-spanning write (size 64) of single field \"\u0026regs.a1\" at ./arch/arm64/include/asm/rsi_cmds.h:119 (size 8)\nWARNING: ./arch/arm64/include/asm/rsi_cmds.h:119 at rsi_attestation_token_init+0xdc/0xf8 [arm_cca_guest], CPU#0: cat/3314",
  "id": "CVE-2026-93266",
  "modified": "2026-09-26T03:30:38.239645293Z",
  "published": "2026-09-24T15:52:05.559Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93266.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93266"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "arm64: RSI: fix field-spanning write warning in attestation token init"
}