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Debian: qemu Critical Privilege Escalation Fix DSA-5983-1

This update removes the usage of the C (Credential) flag for the binfmt_misc registration within the qemu-user package, as it allowed for privilege escalation when running a suid/sgid binary under qemu-user. This means suid/sgid foreign-architecture binaries are not running with . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-5983-1 This email address is being protected from spambots. You need JavaScript enabled to view it. https://www.debian.org/security/ Moritz Muehlenhoff August 22, 2025 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : qemu CVE ID : CVE-2025-54566 CVE-2025-54567 This update removes the usage of the C (Credential) flag for the binfmt_misc registration within the qemu-user package, as it allowed for privilege escalation when running a suid/sgid binary under qemu-user. This means suid/sgid foreign-architecture binaries are not running with elevated privileges under qemu-user anymore. If you relied on this behavior of qemu-user in the past (running suid/sgid foreign-arch binaries), this will require changes to your deployment. In Bookworm the affected packages are qemu-user-static (and qemu-user-binfmt) instead of qemu-user. Additionally, two security issues were fixed the in SR-IOV support of QEMU system emulation. For the oldstable distribution (bookworm), these problems have been fixed in version 1:7.2+dfsg-7+deb12u15. For the stable distribution (trixie), these problems have been fixed in version 1:10.0.2+ds-2+deb13u1. We recommend that you upgrade your qemu packages. For the detailed security status of qemu please refer to its security tracker page at: https://security-tracker.debian.org/tracker/source-package/qemu Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailinglist: This email address is being protected from spambots. You need JavaScript enabled to view it. . This notice informs users of a critical patch for qemu in Debian, addressing vulnerabilities that may allow unauthorized privilege escalation due to unverified executables.. Debian, qemu, security update. . Severity: Critical. LinuxSecurity.com Team

Aug 22, 2025 •Critical Debian