CVE-2023-1386: Fedoraproject Fedora

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. When a local user in the guest writes an executable file with SUID or SGID, none of these privileged bits are correctly dropped. As a result, in rare circumstances, this flaw could be used by malicious users in the guest to elevate their privileges within the guest and help a host local user to elevate privileges on the host.

Affected products

• Fedoraproject Fedora: version 38 only
• Qemu Qemu: any version

Published 2023-07-24. Last modified 2026-06-17.