CVE-2021-3975

medium

Published 2022-05-10 · Modified 2022-05-10

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

5.5

Description

A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
sles		affected
rocky	8	fixed
debian	bookworm	fixed	`7.6.0-1`
debian	bullseye	fixed	`7.0.0-3+deb11u3`
debian	forky	fixed	`7.6.0-1`
debian	sid	fixed	`7.6.0-1`
debian	trixie	fixed	`7.6.0-1`
almalinux	8	fixed	`swtpm-devel-0.7.0-1.20211109gitb79fd91.module_el8.6.0+2880+7d9e3703.x86_64.rpm`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.