Use-after-free in Linux kernel - CVE-2026-53401
Published: July 21, 2026
Vulnerability identifier: #VU138861
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53401
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to access freed physical memory.
The vulnerability exists due to a use-after-free in omapfb_mmap when racing a memory mapping request with OMAPFB_SETUP_PLANE and OMAPFB_SETUP_MEM operations. A local user can trigger concurrent framebuffer operations to access freed physical memory.
The issue is caused by inconsistent use of region data and map_count tracking across concurrent execution paths.
Affected software
Linux kernel
How to mitigate CVE-2026-53401
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3