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Vulnerability record · CVE-2022-47952 · published 1 January 2023

CVE-2022-47952: Linuxcontainers lxc observable discrepancy vulnerability

Linuxcontainers · Lxc

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.

3.3 CVSS 3.1 Low EPSS 0.70% · top 48.4% CWE-203 · Observable discrepancy
3.3CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591/comments/45 Issue TrackingVendor Advisory
https://github.com/MaherAzzouzi/CVE-2022-47952 Third Party Advisory
https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/lxc.spec.in#L274 Third Party Advisory
https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/src/lxc/cmd/lxc_user_nic.c#L1085-L1104 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00025.html
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591/comments/45 Issue TrackingVendor Advisory
https://github.com/MaherAzzouzi/CVE-2022-47952 Third Party Advisory
https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/lxc.spec.in#L274 Third Party Advisory
https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/src/lxc/cmd/lxc_user_nic.c#L1085-L1104 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00025.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-47952), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.