SB20260918142 - Out-of-bounds write in Linux kernel cxl core driver
Published: September 18, 2026
Security Bulletin ID
SB20260918142
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-93077)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to write beyond the feature output buffer.
The vulnerability exists due to improper bounds checking in cxl_get_feature() when a CXL device returns more feature data than requested during a partial read iteration. A local user can cause a CXL device to return more feature data than requested to write beyond the feature output buffer.
Remediation
Install update from vendor's website.