RHSA-2026:99603 - Security Advisory

Topic

An update for cockpit is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line sessions, and more.

Security Fix(es):

• cockpit: Cockpit: Local privilege escalation via insecure symlink handling in public key addition helper (CVE-2026-91151)
• cockpit: cockpit: Denial of Service via unbounded fragmented WebSocket messages (CVE-2026-91150)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 8.10 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 8.10 s390x

Fixes

• BZ - 2478404 - CVE-2026-91151 cockpit: Cockpit: Local privilege escalation via insecure symlink handling in public key addition helper
• BZ - 2478436 - CVE-2026-91150 cockpit: cockpit: Denial of Service via unbounded fragmented WebSocket messages

CVEs

• CVE-2026-91150
• CVE-2026-91151

References

• https://access.redhat.com/security/updates/classification/#important