CVE-2022-47952: linuxcontainers lxc Observable Discrepancy

Vulnerability summary

CVE-2022-47952 is a low (CVSS 3.3) Observable Discrepancy vulnerability in linuxcontainers lxc. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.3% of scored vulnerabilities.

Timeline

1. 01-01-2023
   PublishedVulnerability first disclosed.
2. 10-04-2025
   Last modifiedVulnerability information updated.

Description

lxc-user-nic in lxc through 5.0.1 is installed setuid root, and may allow local users to infer whether any file exists, even within a protected directory tree, because "Failed to open" often indicates that a file does not exist, whereas "does not refer to a network namespace path" often indicates that a file exists. NOTE: this is different from CVE-2018-6556 because the CVE-2018-6556 fix design was based on the premise that "we will report back to the user that the open() failed but the user has no way of knowing why it failed"; however, in many realistic cases, there are no plausible reasons for failing except that the file does not exist.

• CWE-203Observable DiscrepancyThe product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.