CVE-2021-3667

Name	CVE-2021-3667
Description	An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly released on ACL permission failure. Clients connecting to the read-write socket with limited ACL permissions could use this flaw to acquire the lock and prevent other users from accessing storage pool/volume APIs, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs	991594

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libvirt (PTS)	buster	5.0.0-4+deb10u1	vulnerable
	bullseye	7.0.0-3	vulnerable
	bookworm, sid	9.0.0-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libvirt	source	stretch	(not affected)
libvirt	source	(unstable)	7.6.0-1			991594

Notes

[bullseye] - libvirt <no-dsa> (Minor issue)
[buster] - libvirt <no-dsa> (Minor issue)
[stretch] - libvirt <not-affected> (Introduced in 4.1)
https://libvirt.org/git/?p=libvirt.git;a=commit;h=447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87 (v7.6.0-rc1)
Introduced in https://libvirt.org/git/?p=libvirt.git;a=commit;h=7aa0e8c0cb8a6293d0c6f7e3d29c13b96dec2129