Allocation of Resources Without Limits or Throttling Affecting libvirt-lock-sanlock package, versions <0:4.5.0-36.amzn2.3.2


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.22% (12th percentile)

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  • Snyk IDSNYK-AMZN2-LIBVIRTLOCKSANLOCK-14882546
  • published7 Jan 2026
  • disclosed11 Nov 2025

Introduced: 11 Nov 2025

CVE-2025-12748  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 libvirt-lock-sanlock to version 0:4.5.0-36.amzn2.3.2 or higher.
This issue was patched in ALAS2-2025-3115.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libvirt-lock-sanlock package and not the libvirt-lock-sanlock package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.

CVSS Base Scores

version 3.1