CVE-2026-30892
Description
A flaw was found in crun, an open-source OCI Container Runtime. A local user can exploit this vulnerability due to incorrect parsing of the --user option when using crun exec. The value 1 is misinterpreted as root privileges (User ID 0 and Group ID 0) instead of the intended User ID 1 and Group ID 0. This allows a process to run with higher privileges than expected, leading to privilege escalation.
Statement
Red Hat has rated this vulnerability as Moderate because the flaw exists in the OCI container runtime crun. When crun exec -u 1 is used, crun incorrectly interprets UID 1 as UID 0 (root), causing the executed process to run with root privileges inside the container instead of as the intended unprivileged user.
Successful exploitation requires local access to container management operations. An attacker must already have the ability to invoke crun exec against an existing container. The vulnerability is not remotely exploitable and cannot be triggered by an unauthenticated attacker.
Additionally, the privilege escalation is limited to the container context. While the flaw allows an attacker to obtain root privileges within the affected container, there is no demonstrated container escape or direct compromise of the host system resulting from this issue alone.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.8 | 7.8 | 0 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | None |
| Integrity Impact | High | High | None |
| Availability Impact | High | High | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
Understanding the Weakness (CWE)
Integrity
Technical Impact: Unexpected State
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