Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel - CVE-2026-93216
Published: September 25, 2026
Vulnerability identifier: #VU152186
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93216
CWE-ID: CWE-367
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 a time-of-check to time-of-use race condition in print_page_owner_memcg() in mm/page_owner.c when a page is concurrently freed and reallocated. A local user can race page freeing and reallocation to trigger VM_BUG_ON assertions and cause a denial of service.
The issue affects builds configured with CONFIG_DEBUG_VM=y.
Affected software
Linux kernel
How to mitigate CVE-2026-93216
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3