CVE-2026-4878

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

State: Published
Severity: 6.7 Medium
Published: Apr 9, 2026
Updated: Oct 14, 2026
Reserved: Mar 26, 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.

Scores

CVSS	Score	Vector	Source
3.1	6.7 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H	redhat
3.1	6.7 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H	redhat-SADP

Weaknesses

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:2.69-7.el10_1.1 and laterNot affected
Red Hat Enterprise Linux 10Red Hat	0:2.69-7.el10_2.1 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:2.69-7.el10_0.1 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.48-6.el8_10.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:2.48-4.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:2.48-4.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:2.48-5.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:2.48-5.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.48-10.el9_7.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.48-10.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.48-10.el9_7.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.48-10.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.48-9.el9_2.1 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:2.48-9.el9_4.1 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.48-9.el9_6.1 and laterNot affected
Red Hat OpenShift Container Platform 4.12Red Hat	412.86.202608241157-0 and laterNot affected
Red Hat OpenShift Container Platform 4.13Red Hat	413.92.202606160406-0 and laterNot affected
Red Hat OpenShift Container Platform 4.14Red Hat	414.92.202606231112-0 and laterNot affected
Red Hat OpenShift Container Platform 4.15Red Hat	415.92.202606030318-0 and laterNot affected
Red Hat OpenShift Container Platform 4.16Red Hat	416.94.202606051757-0 and laterNot affected
Red Hat OpenShift Container Platform 4.17Red Hat	417.94.202606250942-0 and laterNot affected
Red Hat OpenShift Container Platform 4.18Red Hat	418.94.202606051320-0 and laterNot affected
Red Hat OpenShift Container Platform 4.19Red Hat	4.19.9.6.202606031700-0 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat	1791371080 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat	1791371069 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat	1791788287 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat	1791970484 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat	1791459707 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat	1791459711 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat	1791459759 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat	1789029076 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat	1791966259 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.20Red Hat	1790598593 and laterNot affected
Cost Management 4Red Hat	1780946239 and laterNot affected
Cost Management 4Red Hat	1783539156 and laterNot affected
Red Hat AI Inference Server 3.2Red Hat	1780681984 and laterNot affected
Red Hat AI Inference Server 3.3Red Hat	1782352950 and laterNot affected
Red Hat AI Inference Server 3.3Red Hat	1782352919 and laterNot affected
Red Hat AI Inference Server 3.3Red Hat	1782353093 and laterNot affected
Red Hat AI Inference Server 3.3Red Hat	1782352847 and laterNot affected
Red Hat Discovery 2Red Hat	1778101579 and laterNot affected
Red Hat Discovery 2Red Hat	1778156756 and laterNot affected
Red Hat Discovery 2Red Hat	1782159791 and laterNot affected
Red Hat Discovery 2Red Hat	1782166952 and laterNot affected
Red Hat Hardened ImagesRed Hat	2.78-1.1.hum1 and laterNot affected
Red Hat Insights proxy 1.5Red Hat	1780420428 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1790703542 and laterNot affected
Red Hat OpenShift distributed tracing 3.9.3Red Hat	1778056267 and laterNot affected
Red Hat OpenShift distributed tracing 3.9.3Red Hat	1778056233 and laterNot affected
Red Hat OpenShift distributed tracing 3.9.3Red Hat	1778056245 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1779798159 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1779798164 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1779798165 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1779798222 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1787241211 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1787135742 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1787241260 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat OpenShift Container Platform 4Red Hat

References

RHSA-2026:12423vendor-advisory
RHSA-2026:12441vendor-advisory
RHSA-2026:13285vendor-advisory
RHSA-2026:14162vendor-advisory
RHSA-2026:14937vendor-advisory
RHSA-2026:19130vendor-advisory
RHSA-2026:19346vendor-advisory
RHSA-2026:19456vendor-advisory
RHSA-2026:19458vendor-advisory
RHSA-2026:20595vendor-advisory
RHSA-2026:21254vendor-advisory
RHSA-2026:21275vendor-advisory
RHSA-2026:22634vendor-advisory
RHSA-2026:22957vendor-advisory
RHSA-2026:23233vendor-advisory
RHSA-2026:23245vendor-advisory
RHSA-2026:24346vendor-advisory
RHSA-2026:25044vendor-advisory
RHSA-2026:25096vendor-advisory
RHSA-2026:25181vendor-advisory
RHSA-2026:26542vendor-advisory
RHSA-2026:27998vendor-advisory
RHSA-2026:28887vendor-advisory
RHSA-2026:29197vendor-advisory
RHSA-2026:30078vendor-advisory
RHSA-2026:30087vendor-advisory
RHSA-2026:30088vendor-advisory
RHSA-2026:30089vendor-advisory
RHSA-2026:34098vendor-advisory
RHSA-2026:39981vendor-advisory
RHSA-2026:58981vendor-advisory
RHSA-2026:59831vendor-advisory
RHSA-2026:72502vendor-advisory
RHSA-2026:74674vendor-advisory
RHSA-2026:7473vendor-advisory
RHSA-2026:82304vendor-advisory
RHSA-2026:82322vendor-advisory
RHSA-2026:82347vendor-advisory
RHSA-2026:82354vendor-advisory
RHSA-2026:82372vendor-advisory
RHSA-2026:82857vendor-advisory
RHSA-2026:82888vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-4878vdb-entry
https://bugzilla.redhat.com/show_bug.cgi?id=2447554
RHBZ#2451615issue-tracking
http://www.openwall.com/lists/oss-security/2026/04/07/4
http://www.openwall.com/lists/oss-security/2026/04/07/14
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
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4878.json

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