arm64: RSI: fix field-spanning write warning in attestation token init
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
CVE-2026-93266
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93266
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b880a80011f56880f32bde47fc6af313359f926b",
"lessThan": "e505092cb200d430d5b8d8d3e926d45f29474ba3",
"versionType": "git"
},
{
"status": "affected",
"version": "b880a80011f56880f32bde47fc6af313359f926b",
"lessThan": "d29a8ee271da17b5e32d7a76a9c78d43f66447ca",
"versionType": "git"
},
{
"status": "affected",
"version": "b880a80011f56880f32bde47fc6af313359f926b",
"lessThan": "221049874b6a78c7d87bc826581b0695cd338e2b",
"versionType": "git"
}
],
"programFiles": [
"arch/arm64/include/asm/rsi_cmds.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/include/asm/rsi_cmds.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93266
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37958 · Revision 1
- Added to Heist Feed
- Publisher date