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Debian Linux Critical Privilege Escalation and Denial of Service DSA-6528

Linuxsecurity •LinuxSecurity Advisories • September 29, 2026

CISA confirms exploitation of a Linux firewall flaw. Check if your systems need the fix. ×

For the stable distribution (trixie), these problems have been fixed in version 6.12.111-1. We recommend that you upgrade your linux packages. For the detailed security status of linux please refer to its security tracker page at: Further information Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at:

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Critical Vulnerabilities in Debian Dovecot and Flatpak Exploited Recent advisories from CISA confirm active exploitation of critical vulnerabilities in Debian's Dovecot and Flatpak packages. The vulnerabilities include a Denial of Service (DoS) flaw in Dovecot (CVE-2026-90616) and a privilege escalation and DoS issue in Linux. The Dovecot vulnerability was patched in version 1:2.4.1+dfsg1-6+deb13u7, while the Flatpak flaw was addressed in version 1.16.6-1~deb13u3. Debian users are urged to upgrade their packages immediately to mitigate risks. The vulnerabilities primarily affect the stable distribution 'trixie'. The advisories highlight the urgent need for system administrators to apply the patches to prevent potential exploitation. 4 sources 73

Extracted Entities

Debian Linux Critical Privilege Escalation and Denial of Service DSA-6528

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Extracted Entities

Attack Types (2)

MITRE ATT&CK (1)

Platforms (1)