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MEDIUM · 6.7

CVE-2026-4878

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 ...

Vulnerability 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.

CVSS Score

6.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
Libcap ProjectLibcap-
RedhatOpenshift Container Platform4.0
RedhatEnterprise Linux8.0

Related Weaknesses (CWE)

CWE-367

References

FAQ

What is CVE-2026-4878?

CVE-2026-4878 is a vulnerability with a CVSS score of 6.7 (MEDIUM). 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 ...

How severe is CVE-2026-4878?

CVE-2026-4878 has been rated MEDIUM with a CVSS base score of 6.7/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-4878?

Check the references section above for vendor advisories and patch information. Affected products include: Libcap Project Libcap, Redhat Openshift Container Platform, Redhat Enterprise Linux.