Use-after-free in Linux kernel - CVE-2026-74563
Published: August 16, 2026
Vulnerability identifier: #VU143222
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74563
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to use-after-free in rds_tcp_laddr_check() and ipv6 address checking when processing a bind request with a scoped IPv6 interface. A local user can trigger a concurrent device removal condition and issue a bind operation to disclose sensitive information.
The issue is caused by dereferencing a stale net_device pointer after the RCU read-side lock is released.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74563
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef
- https://git.kernel.org/stable/c/78f75d632f74b8de0f081a128588f7c37d0d1164
- https://git.kernel.org/stable/c/8398bc477d3cb3e2b018a5aaac2bec0f69acda30
- https://git.kernel.org/stable/c/b1d480fce05f857dc438080cd8c9244b84a83494
- https://git.kernel.org/stable/c/f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff