CVE-2021-3582

QEMU: pvrdma: unproperly mremap in pvrdma_map_to_pdir()

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Severity

Low

Red Hat Product Security

3.2

CVSS 3.1

Review impact separately from score.

Published · June 16, 2021

Updated · June 28, 2026

Description

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. The issue occurs while handling a "PVRDMA_CMD_CREATE_MR" command due to improper memory remapping (mremap). This flaw allows a malicious guest to crash the QEMU process on the host. The highest threat from this vulnerability is to system availability.

Statement

The versions of qemu-kvm as shipped with Red Hat Enterprise Linux and RHEL Advanced Virtualization are not affected by this flaw, as they are not built with PVRDMA support.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 3.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer