CVE-2026-4878
Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()
CVSS Score
6.7
EPSS Score
0.0%
EPSS Percentile
1th
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 | Apr 17, 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 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 Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected References
access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-4878 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2447554 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2451615 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/07/4 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/07/14 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/08/9 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/09/5 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/09/6
Credits
Red Hat would like to thank Ali Raza for reporting this issue.