NULL pointer dereference in Linux kernel - CVE-2026-52925
Published: June 25, 2026
Vulnerability identifier: #VU135453
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-2026-52925
CWE-ID: CWE-476
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 null pointer dereference in the VRF port removal logic when removing a port from a VRF while concurrent RCU readers access the master device. A local user can trigger concurrent network operations to cause a denial of service.
The issue occurs because an RCU reader can observe a new non-VRF master device and then dereference missing l3mdev operations.
How to mitigate CVE-2026-52925
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2674d603a9e6970463b2b9ebcf8e31e90beae169
- https://git.kernel.org/stable/c/2c022f582fd16a470df6ed9e7fb7e9fc48946d49
- https://git.kernel.org/stable/c/3db8d078f7f652379ee394132b169d304f6eb4c1
- https://git.kernel.org/stable/c/468defa0b70902a22f4478c1207624bc1b31c124
- https://git.kernel.org/stable/c/4ab6fc60ed5a0344b60711b09bff1dc238d8d6a4
- https://git.kernel.org/stable/c/8c2b792f04a3db97c9d8d2a45817e93f8884baf5
- https://git.kernel.org/stable/c/a7a97f2303e63ede105c1d55ef53dc497364e11d
- https://git.kernel.org/stable/c/d47204c127992da0c976ac9747070a575912e0fe