Medium6.7Vendor: HighRed Hat Linux

Medium [CVE-2026-4878] Privilege escalation via TOCTOU race condition in cap_set_file()

This medium-severity Red Hat Linux advisory covers CVE-2026-4878 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

CVE-2026-4878 Published Apr 6, 2026

CVE-2026-4878

Affected products & platforms

Red Hat LinuxUnclassified

Open vendor advisory

Android app · Google Play

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

Privilege escalation via TOCTOU race condition in cap_set_file(). Red Hat rates this important (CVSS 6.7).

Weakness: CWE-367. Affected package(s): rhaiis/model-opt-cuda-rhel9:1782352950, rhaiis/vllm-spyre-rhel9:1782352919, libcap, rhui5/haproxy-rhel9:1779798164, rhcos, libcap-main.

Resolved in Red Hat advisory RHSA-2026:26542 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; and 40 more.

Affected versions

rhaiis/model-opt-cuda-rhel9:1782352950
rhaiis/vllm-spyre-rhel9:1782352919
libcap-0:2.69-7.el10_2.1
rhui5/haproxy-rhel9:1779798164
libcap-0:2.69-7.el10_0.1
libcap-0:2.69-7.el10_1.1
rhcos-414.92.202606231112-0
libcap-main-2.78-1.1.hum1
discovery/discovery-server-rhel9:1782159791
libcap-0:2.48-9.el9_4.1
rhui5/rhua-rhel9:1779798222
libcap-0:2.48-6.el8_10.1

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:26542

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:26542 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.