Use-after-free in Linux kernel - CVE-2026-64560
Published: July 30, 2026
Vulnerability identifier: #VU140100
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64560
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to a use-after-free in the posix CPU timers subsystem when handling a non-leader exec() race involving POSIX CPU timer deletion, setting, or rearming. A local user can trigger concurrent exec() and timer operations to execute arbitrary code.
The issue occurs when a TGID-targeted timer remains inherited across exec(), and can also cause user-visible transient -ESRCH errors or prevent timer rearming.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64560
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1