SB2026091828 - Uncontrolled Memory Allocation in Linux kernel cxl core driver
Published: September 18, 2026
Security Bulletin ID
SB2026091828
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-93186)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in the CXL mailbox command constructor cxl_mbox_cmd_ctor() when processing CXL_MEM_SEND_COMMAND requests with an oversized output size. A local user can submit a command with a large output size to cause a denial of service.
A system panic requires panic_on_warn=1.
Remediation
Install update from vendor's website.