CVE-2021-20263: Qemu

Low severity, CVSS 3.3. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.

Affected products

• Qemu Qemu: from 5.0.0, before 5.2.50 (fixed in 5.2.50)

Published 2021-03-09. Last modified 2026-06-17.