Incorrect Permission Assignment for Critical Resource Affecting libvirt-nss package, versions <0:4.5.0-36.amzn2.3.3


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.1% (1st percentile)

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  • Snyk IDSNYK-AMZN2-LIBVIRTNSS-19456702
  • published1 Sept 2026
  • disclosed10 Aug 2026

Introduced: 10 Aug 2026

CVE-2026-63623  (opens in a new tab)
CWE-732  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 libvirt-nss to version 0:4.5.0-36.amzn2.3.3 or higher.
This issue was patched in ALAS2-2026-3873.

NVD Description

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

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the qemu-img utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.

CVSS Base Scores

version 3.1