SB20260816133 - Improper Initialization in Linux kernel mpls
Published: August 16, 2026
Security Bulletin ID
SB20260816133
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Initialization (CVE-ID: CVE-2026-74577)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.
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