Use-after-free in Linux kernel - CVE-2026-53157
Published: June 26, 2026
Vulnerability identifier: #VU135621
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-2026-53157
CWE-ID: CWE-416
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 use-after-free in phonet_device_destroy() when walking the per-net phonet device list with RCU readers after device removal. A local user can trigger destruction of a phonet_device while concurrent readers still hold a stale pointer to cause a denial of service.
The issue arises because the object is removed with RCU list semantics but may be freed before the RCU grace period has elapsed.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-53157
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.95-1
linux (Debian package) - update to 6.12.95-1