SB20260918144 - Out-of-bounds write in Linux kernel cxl core driver
Published: September 18, 2026
Security Bulletin ID
SB20260918144
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-93079)
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:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in cxlctl_get_feature() when processing FWCTL_RPC Get Feature requests with a count larger than the available output payload room. A local user can provide a small output length and a large feature count to cause memory corruption.
Remediation
Install update from vendor's website.