CVE-2021-20263

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.

• CWE-281
• CWE-281

• https://bugzilla.redhat.com/show_bug.cgi?id=1933668Issue Tracking, Patch, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210507-0002/Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/03/08/1Mailing List, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1933668Issue Tracking, Patch, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210507-0002/Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/03/08/1Mailing List, Patch, Third Party Advisory

Published

Mar 9, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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