CVE-2026-4878
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
09/04/2026
Last modified:
13/04/2026
Description
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.
Impact
Base Score 3.x
6.70
Severity 3.x
MEDIUM
References to Advisories, Solutions, and Tools
- https://access.redhat.com/security/cve/CVE-2026-4878
- https://bugzilla.redhat.com/show_bug.cgi?id=2447554
- https://bugzilla.redhat.com/show_bug.cgi?id=2451615
- http://www.openwall.com/lists/oss-security/2026/04/07/14
- http://www.openwall.com/lists/oss-security/2026/04/07/4
- http://www.openwall.com/lists/oss-security/2026/04/08/9
- http://www.openwall.com/lists/oss-security/2026/04/09/5
- http://www.openwall.com/lists/oss-security/2026/04/09/6