SB20260925110 - Out-of-bounds write in Linux kernel include asm
Published: September 25, 2026
Security Bulletin ID
SB20260925110
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-93266)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a field-spanning write in rsi_attestation_token_init when copying an attestation challenge into the SMCCC register structure. A local user can invoke attestation token initialization with a crafted challenge to cause a denial of service.
Challenge sizes from 32 through 64 bytes are accepted.
Remediation
Install update from vendor's website.