Use-after-free in Linux kernel - CVE-2026-63797
Published: July 21, 2026
Vulnerability identifier: #VU138852
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-2026-63797
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 rpmsg_chrdev_probe() and the rpmsg character device endpoint callback handling in drivers/rpmsg/rpmsg_char.c when processing callbacks during a probe error path. A local user can trigger endpoint creation failure and concurrent callback handling to cause a denial of service.
The issue occurs because the default endpoint's priv pointer can reference freed memory before endpoint setup has completed.
Affected software
Linux kernel
How to mitigate CVE-2026-63797
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/104d100212396801f1d9d388282f746e23e2bfd6
- https://git.kernel.org/stable/c/1ff3f528e67d20e2b1483dcaba899dc7832b2e6b
- https://git.kernel.org/stable/c/c5ebb06c7e24d531b68707168e04698859d642bc
- https://git.kernel.org/stable/c/ddf13f91ca82c94ef7ad9c41a434a03313f8eb1b
- https://git.kernel.org/stable/c/ff268cd9ccbce6472a0658791b417bf11c31ee39