CVE-2021-4147

unknown

Published — · Modified —

CVSS v3

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CVSS v2

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VIR risk

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Description

A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-4147

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-4147.html

OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	fixed	`7.10.0-2`
debian	bullseye	fixed	`7.0.0-3+deb11u3`
debian	forky	fixed	`7.10.0-2`
debian	sid	fixed	`7.10.0-2`
debian	trixie	fixed	`7.10.0-2`

References

https://www.suse.com/security/cve/CVE-2021-4147.html
https://security-tracker.debian.org/tracker/CVE-2021-4147

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