🛡️ CVE-2026-4878 — enterprise-linux

🟡 CVSS 6.7 — Medium ⚠️ Exploit Public CWE-367 NVD
6.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-4878 is classified as CWE-367: Time-of-check Time-of-use Race Condition. The state checked and the state acted upon can differ, because it may change between the two steps.

Affected software

CVE-2026-4878 is recorded against 3 packages.

  • enterprise-linux
  • libcap
  • openshift-container-platform

Timeline and source

Published on 9 April 2026 and last revised on 10 August 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

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CVE-2026-4878 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 6.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE CWE-367
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-09
Updated 2026-08-11
Modified 2026-08-10
Fix URL N/A

Affected Packages

Software From version Fixed in
enterprise-linux — —
libcap — —
openshift-container-platform — —

References

Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2451615
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2026/04/07/4
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2026/04/08/9
Exploit, Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2026/04/09/5
Exploit, Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2026/04/09/6
Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2451615

Similar Threats

Exploit Protection

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