Time-of-check Time-of-use (TOCTOU) The advisory has been revoked - it doesn't affect any version of package rhcos (opens in a new tab)

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Snyk IDSNYK-RHEL7-RHCOS-16000875
published13 Apr 2026
disclosed6 Apr 2026

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Introduced: 6 Apr 2026

CVE-2026-4878 (opens in a new tab) CWE-367 (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhcos package and not the rhcos package as distributed by RHEL.

A flaw was found in libcap. A local unprivileged user can exploit a Time-of-check-to-time-of-use (TOCTOU) race condition in the cap_set_file() function. This allows an attacker with write access to a parent directory to redirect file capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.