CVE-2021-3608

Severity: medium (CVSS 6.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-24 · updated 2026-06-17
Weakness: CWE-824

Description

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to 6.1.0. The issue occurs while handling a "PVRDMA_REG_DSRHIGH" write from the guest and may result in a crash of QEMU or cause undefined behavior due to the access of an uninitialized pointer. The highest threat from this vulnerability is to system availability.

Affected products

Debian Linux: 10.0
Fedoraproject Fedora: 34
QEMU: before 6.1.0 — fixed in 6.1.0

How to fix

Upgrade to a fixed version: QEMU 6.1.0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1973383
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
https://lists.gnu.org/archive/html/qemu-devel/2021-06/msg07926.html
https://security.gentoo.org/glsa/202208-27
https://security.netapp.com/advisory/ntap-20220318-0002/
https://bugzilla.redhat.com/show_bug.cgi?id=1973383
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
https://lists.gnu.org/archive/html/qemu-devel/2021-06/msg07926.html
https://security.gentoo.org/glsa/202208-27
https://security.netapp.com/advisory/ntap-20220318-0002/

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