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CVE-2021-20263

Published: 9 March 2021

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.

Notes

AuthorNote
mdeslaur
introduced in 5.2.0

Priority

Low

Cvss 3 Severity Score

3.3

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
jammy Not vulnerable
(1:5.2+dfsg-9ubuntu3)
impish Not vulnerable
(1:5.2+dfsg-9ubuntu3)
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy Not vulnerable
(code not present)
upstream Needs triage

hirsute Not vulnerable
(1:5.2+dfsg-9ubuntu3)
trusty Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=e586edcb410543768ef009eaa22a2d9dd4a53846
qemu-kvm
Launchpad, Ubuntu, Debian
jammy Does not exist

impish Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 3.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N