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…

PriorityP412low3.3CVSS 3.1

AVLACLPRLUINSUCNILAN

EPSS

0.38%

29.7th percentile

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

7 ranges

Vendor	Product	Version range	Fixed in
debian	qemu	< qemu 1:5.2+dfsg-9 (bookworm)	qemu 1:5.2+dfsg-9 (bookworm)
qemu	qemu	—	—
qemu	qemu	>= 0 < 1:5.2+dfsg-9	1:5.2+dfsg-9
qemu	qemu	>= 0 < 1:5.2+dfsg-9	1:5.2+dfsg-9
qemu	qemu	>= 0 < 1:5.2+dfsg-9	1:5.2+dfsg-9
qemu	qemu	>= 0 < 1:5.2+dfsg-9	1:5.2+dfsg-9
qemu	qemu	>= 5.0.0 < 5.2.50	5.2.50

CVSS provenance

nvdv3.13.3LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

nvdv2.02.1LOWAV:L/AC:L/Au:N/C:N/I:P/A:N

osv3.3LOW

vendor_debian3.3LOW

vendor_redhat3.3LOW

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