CVE-2026-93266

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: arm64: RSI: fix field-spanning write warning in attestation token init The challenge is passed in registers a1 through a8. However, copying to &regs.a1 makes FORTIFY treat the destination as the single a1 field, resulting in a field-spanning write warning. [1] Overlay the SMCCC register structure with an RSI-specific argument layout and copy the challenge into an explicit 64-byte array. This keeps the existing a1-a8 argument encoding while giving the copy a correctly sized destination object. [1] memcpy: detected field-spanning write (size 64) of single field "&regs.a1" at ./arch/arm64/include/asm/rsi_cmds.h:119 (size 8) WARNING: ./arch/arm64/include/asm/rsi_cmds.h:119 at rsi_attestation_token_init+0xdc/0xf8 [arm_cca_guest], CPU#0: cat/3314

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-24 16:17:23.453000

Last modified

2026-10-19 10:17:18.003000

View original CVE JSON

{
  "id": "CVE-2026-93266",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-24T16:17:23.453",
  "lastModified": "2026-10-19T10:17:18.003",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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&regs.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 \"&regs.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"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/arm64/include/asm/rsi_cmds.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "b880a80011f56880f32bde47fc6af313359f926b",
              "lessThan": "e505092cb200d430d5b8d8d3e926d45f29474ba3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b880a80011f56880f32bde47fc6af313359f926b",
              "lessThan": "d29a8ee271da17b5e32d7a76a9c78d43f66447ca",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b880a80011f56880f32bde47fc6af313359f926b",
              "lessThan": "221049874b6a78c7d87bc826581b0695cd338e2b",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "arch/arm64/include/asm/rsi_cmds.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.13",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.13",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}