CVE-2022-47952
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 o
Published Jan 1, 2023 · updated Oct 15, 2026
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.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jan 1, 2023 · OSV.dev
Detected
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 wa
Oct 15, 2026 · OSV.dev
Fix available
lxc fixed in 4.0.10-r2; lxc fixed in 4.0.12-r2; lxc fixed in 4.0.12-r2; lxc fixed in 5.0.1-r2
Oct 15, 2026 · OSV.dev
Fix available
lxc fixed in 4.0.10-r2
Oct 15, 2026 · OSV.dev
Fix available
lxc fixed in 4.0.12-r2
Oct 15, 2026 · OSV.dev
Fix available
lxc fixed in 5.0.1-r2
Oct 15, 2026 · OSV.dev
Updated
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 wa
Affected
- Alpine:v3.14 lxc0 → 4.0.10-r2
- Alpine:v3.15 lxc0 → 4.0.12-r2
- Alpine:v3.16 lxc0 → 4.0.12-r2
- Alpine:v3.17 lxc0 → 5.0.1-r2
- Alpine:v3.18 lxc0 → 5.0.1-r2
- Alpine:v3.19 lxc0 → 5.0.1-r2
- Alpine:v3.20 lxc0 → 5.0.1-r2
- Alpine:v3.21 lxc0 → 5.0.1-r2
- Alpine:v3.22 lxc0 → 5.0.1-r2
- Alpine:v3.23 lxc0 → 5.0.1-r2
- Alpine:v3.24 lxc0 → 5.0.1-r2