UNKNOWN NVD
CVE-2026-93266
In the Linux kernel, the following vulnerability has been resolved: arm64: RSI: fix field-spanning write warning in attestation token init The challenge is pa
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
®s.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 "®s.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
References
- https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b
- https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca
- https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3
This unknown severity vulnerability was published on 2026-09-24 via NVD.
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