Debian Linux kernel patches multiple privilege escalation flaws
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Debian LTS kernel updates patch multiple vulnerabilities allowing privilege escalation, data breach, and denial of service.
CERT-FR has published an advisory on multiple vulnerabilities discovered in the Linux kernel as packaged in Debian bullseye LTS. The affected versions include Debian bullseye kernel versions prior to 5.10.257-1 and 6.1.174-1~deb11u1. These vulnerabilities span multiple impact categories: privilege escalation, confidentiality breach, and denial of service. The advisory directs administrators to apply kernel patches released by Debian LTS, as documented in two separate security bulletins issued on 29 May 2026.
The vulnerability set includes over 200 assigned CVE identifiers affecting the kernel subsystem. Administrators running Debian bullseye with LTS support must prioritize kernel updates to mitigate the risk of local privilege escalation and system compromise. The breadth of the CVE list indicates this is a consolidation of multiple kernel fixes across different subsystems rather than a single widespread defect.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0696
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