Improper Initialization in Linux kernel - CVE-2026-74577
Published: August 16, 2026
Vulnerability identifier: #VU143195
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74577
CWE-ID: CWE-665
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 improper initialization in mpls_getroute() when handling RTM_GETROUTE requests. A local user can send a crafted netlink route request to disclose sensitive information.
The issue leaks one byte of uninitialized heap memory to user space in the RTM_NEWROUTE reply.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74577
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/1fea5ff0eb4aa7e951bb3d380248566c473aa377
- https://git.kernel.org/stable/c/295dd295e2137e10e9a5b1891d97e0f08de76f03
- https://git.kernel.org/stable/c/2dc2fffc704a4365cae1aae078ba62223aaeff93
- https://git.kernel.org/stable/c/95651461cf77cc6590fa08c87667717e5dcfa55d
- https://git.kernel.org/stable/c/a5cdd2407dd890f741f59b8367e4c6c101cce154