SB2026050221 - Out-of-bounds read in Linux kernel mpls
Published: May 2, 2026
Security Bulletin ID
SB2026050221
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-43042)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds access in the mpls forwarding and route dump codepaths when handling concurrent platform label table resizes. A local user can trigger concurrent route operations to cause a denial of service.
The issue arises from an inconsistent view of the platform_labels and platform_label pair during a resize operation.
Remediation
Install update from vendor's website.