CVE-2026-4878

MEDIUM 6.7

Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()

CVSS Score

6.7

EPSS Score

0.0%

EPSS Percentile

2th

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.

CWE	CWE-367
Vendor	red hat
Product	red hat enterprise linux 10
Published	Apr 9, 2026
Last Updated	Jun 8, 2026

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CVSS v3 Breakdown

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 Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

All versions affected

Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service

All versions affected

Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support

All versions affected

Red Hat / Red Hat Discovery 2

All versions affected

Red Hat / Red Hat Discovery 2

All versions affected

Red Hat / Red Hat Hardened Images

All versions affected

Red Hat / Red Hat Insights proxy 1.5

All versions affected

Red Hat / Red Hat OpenShift distributed tracing 3.9.3

All versions affected

Red Hat / Red Hat OpenShift distributed tracing 3.9.3

All versions affected

Red Hat / Red Hat OpenShift distributed tracing 3.9.3

All versions affected

Red Hat / Red Hat Update Infrastructure 5

All versions affected

Red Hat / Red Hat Update Infrastructure 5

All versions affected

Red Hat / Red Hat Update Infrastructure 5

All versions affected

Red Hat / Red Hat Update Infrastructure 5

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

Credits

Red Hat would like to thank Ali Raza for reporting this issue.