NULL Pointer Dereference Affecting virt:rhel/libguestfs-tools-c package, versions <1:1.44.0-5.module_el8.6.0+2880+7d9e3703.alma


Severity

Recommended
0.0
medium
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.04% (5th percentile)

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  • Snyk IDSNYK-ALMALINUX8-VIRT-5729711
  • published28 May 2023
  • disclosed10 May 2022

Introduced: 10 May 2022

CVE-2021-4145  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 virt:rhel/libguestfs-tools-c to version 1:1.44.0-5.module_el8.6.0+2880+7d9e3703.alma or higher.
This issue was patched in ALSA-2022:1759.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt:rhel/libguestfs-tools-c package and not the virt:rhel/libguestfs-tools-c package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The self pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.

CVSS Scores

version 3.1