CVE-2026-4878

MEDIUM

6.7

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.

CVE Details

CVSS v3.1 Score6.7

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityHIGH

Privileges RequiredLOW

User InteractionREQUIRED

Published4/9/2026

Last Modified4/9/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-367

References

https://access.redhat.com/security/cve/CVE-2026-4878(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2447554(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2451615(secalert@redhat.com)

http://www.openwall.com/lists/oss-security/2026/04/07/14(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/04/07/4(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/04/08/9(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/04/09/5(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/04/09/6(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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