CVE-2026-93266
- Source
- https://cve.org/CVERecord?id=CVE-2026-93266
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93266.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-93266
- Downstream
- Published
- 2026-09-24T15:52:05Z
- Modified
- 2026-09-25T03:48:54Z
- Summary
- arm64: RSI: fix field-spanning write warning in attestation token init
- Details
-
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
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93266.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b
- https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca
- https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93266.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-93266