Uncontrolled Memory Allocation in Linux kernel - CVE-2026-93186
Published: September 18, 2026
Vulnerability identifier: #VU150815
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-93186
CWE-ID: CWE-789
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-93186
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3