Time-of-check Time-of-use (TOCTOU) Affecting libcap package, versions <0:2.48-6.el8_10.1


Severity

Recommended
0.0
high
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.21% (11th percentile)

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  • Snyk IDSNYK-ALMALINUX8-LIBCAP-16419428
  • published5 May 2026
  • disclosed19 May 2026

Introduced: 5 May 2026

CVE-2026-4878  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 libcap to version 0:2.48-6.el8_10.1 or higher.
This issue was patched in ALSA-2026:13285.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcap package and not the libcap package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

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.

References

CVSS Base Scores

version 3.1