Debian Linux kernel vulnerabilities enable privilege escalation and DoS
Multiple vulnerabilities in Debian Linux kernel allow privilege escalation, data confidentiality breach, and denial of service on bookworm and trixie versions.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 5 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-46300 as exploited in the wild.
CERT-FR has issued an advisory regarding multiple security vulnerabilities discovered in the Debian Linux kernel affecting both the bookworm and trixie distributions. The vulnerabilities impact versions prior to 6.1.174-1 for Debian bookworm and versions prior to 6.12.90-2 for Debian trixie. These flaws enable attackers to perform privilege escalation, compromise data confidentiality, and cause denial of service conditions.
The advisory references five distinct CVE identifiers (CVE-2026-23171, CVE-2026-43494, CVE-2026-43503, CVE-2026-46174, CVE-2026-46300), indicating multiple discrete vulnerability classes within the kernel. Debian has released security bulletins between May 23-28, 2026, providing patches to address these issues.
Organizations running affected Debian distributions should prioritize applying the vendor-provided patches. The combination of privilege escalation and confidentiality breach capabilities makes these vulnerabilities particularly concerning for multi-tenant environments and systems processing sensitive data.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0666
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