Use-after-free in Linux kernel - CVE-2026-64051
Published: July 20, 2026
Vulnerability identifier: #VU138592
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64051
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in qaic_gem_object_mmap when mapping a buffer object into memory with scatter-gather segments that extend beyond the virtual memory area. A local user can trigger the mapping of an oversized buffer object to cause a denial of service.
The issue occurs because memory beyond the requested virtual memory area can remain mapped after munmap() unmaps only the virtual memory area region.
How to mitigate CVE-2026-64051
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/8c795012d0e06b7740e40319b86ff8d2a435098d
- https://git.kernel.org/stable/c/8dd6edbe26770df147136c3f2ac976c873b82650
- https://git.kernel.org/stable/c/97a8e89cdef36207a8776edc03d6931763a06ad0
- https://git.kernel.org/stable/c/9baafc2fea096279e75480f93fd5942e8336b510
- https://git.kernel.org/stable/c/aa16b2bc0f02709919e2435f531406531e5bcc69