arm64: RSI: fix field-spanning write warning in attestation token init

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Summary

CVECVE-2026-93266
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:23 UTC
Updated2026-09-24 16:17:23 UTC
DescriptionIn 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b880a80011f56880f32bde47fc6af313359f926b e505092cb200d430d5b8d8d3e926d45f29474ba3 git Not specified
CNA Linux Linux affected b880a80011f56880f32bde47fc6af313359f926b d29a8ee271da17b5e32d7a76a9c78d43f66447ca git Not specified
CNA Linux Linux affected b880a80011f56880f32bde47fc6af313359f926b 221049874b6a78c7d87bc826581b0695cd338e2b git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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