CVE-2021-20263

low-risk
Published 2021-03-09

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.

Do I need to act?

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0.13% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.3/10 Low
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Qemu

References (8)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1933668
Third Party Advisory https://security.gentoo.org/glsa/202208-27
Third Party Advisory https://security.netapp.com/advisory/ntap-20210507-0002/
Mailing List https://www.openwall.com/lists/oss-security/2021/03/08/1
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1933668
Third Party Advisory https://security.gentoo.org/glsa/202208-27
Third Party Advisory https://security.netapp.com/advisory/ntap-20210507-0002/
Mailing List https://www.openwall.com/lists/oss-security/2021/03/08/1
19
/ 100
low-risk
Severity 13/34 · Low
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal