CVE-2026-4878

6.7 MEDIUM

A flaw was found in libcap

Published: 2026-04-09 · Last updated: 2026-06-11

Severity and scoring

CVSS: 6.7 MEDIUM
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-367

Affected products

Vendor	Product
libcap_project	enterprise_linux, libcap, openshift_container_platform
redhat	enterprise_linux, libcap, openshift_container_platform

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-4878
[Other]https://access.redhat.com/errata/RHSA-2026:12423
[Other]https://access.redhat.com/errata/RHSA-2026:12441
[Other]https://access.redhat.com/errata/RHSA-2026:13285
[Other]https://access.redhat.com/errata/RHSA-2026:14162
[Other]https://access.redhat.com/errata/RHSA-2026:14937
[Other]https://access.redhat.com/errata/RHSA-2026:19130
[Other]https://access.redhat.com/errata/RHSA-2026:19346
[Other]https://access.redhat.com/errata/RHSA-2026:19456
[Other]https://access.redhat.com/errata/RHSA-2026:19458
[Other]https://access.redhat.com/errata/RHSA-2026:20595
[Other]https://access.redhat.com/errata/RHSA-2026:21254
[Other]https://access.redhat.com/errata/RHSA-2026:21275
[Other]https://access.redhat.com/errata/RHSA-2026:22634
[Other]https://access.redhat.com/errata/RHSA-2026:22957
[Other]https://access.redhat.com/errata/RHSA-2026:23233
[Other]https://access.redhat.com/errata/RHSA-2026:23245
[Other]https://access.redhat.com/errata/RHSA-2026:24346
[Other]https://access.redhat.com/errata/RHSA-2026:25096
[Vendor advisory]https://access.redhat.com/errata/RHSA-2026:7473
[Vendor advisory]https://access.redhat.com/security/cve/CVE-2026-4878
[Other]https://bugzilla.redhat.com/show_bug.cgi?id=2447554
[Vendor advisory]https://bugzilla.redhat.com/show_bug.cgi?id=2451615
[Other]http://www.openwall.com/lists/oss-security/2026/04/07/14
[Other]http://www.openwall.com/lists/oss-security/2026/04/07/4
[Other]http://www.openwall.com/lists/oss-security/2026/04/08/9
[Exploit reference]http://www.openwall.com/lists/oss-security/2026/04/09/5
[Exploit reference]http://www.openwall.com/lists/oss-security/2026/04/09/6

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