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CVE-2026-4878 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7 HIGHVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA: redhat-SADPCVSS-B:6.7 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:12423 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:12441 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:13285 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:14162 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:14937 redhat-SADP

see all 77 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-367Time-of-check Time-of-use (TOCTOU) Race Conditionredhat-SADP
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition[email protected]

Affected Products

ProductVersions
libcap project libcap
All versions

CPE

  • cpe:2.3:a:libcap_project:libcap:-:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat openshift container platform
4.0

CPE

  • cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat enterprise linux
8.0
9.0
10.0

CPE

  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

93 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-4878
NVD Published Date:
Apr 9, 2026
NVD Last Modified:
Sep 9, 2026
Source:
[email protected]
CVE-2026-4878 Details - Not Deferred