CVE-2026-91142 Red Hat CVE debrief

Who should care

System administrators and defenders responsible for Cockpit installations, especially on 32-bit systems, should assess exposure and prioritize verification and updates. They should also monitor for unusual login record modifications and implement additional logging and monitoring to detect potential exploitation attempts. Additionally, they should review compensating controls for exposed systems while remediation is scheduled and verified, and track

Why it matters

The integer overflow vulnerability in Cockpit allows unauthorized modification and disclosure of login records, requiring verification and updates to prevent potential exploitation.

• Verification of Cockpit installations on 32-bit systems is required to determine exposure.
• Defenders should monitor for unusual login record modifications to detect potential exploitation attempts.
• Remediation priority follows from verifying and updating affected Cockpit installations.

Technical summary

The Cockpit package is vulnerable to an integer overflow during session accounting on 32-bit systems, allowing an authenticated local user with a large user identifier (UID) to cause unauthorized modification and disclosure of login records. This vulnerability requires verification and updates to prevent potential exploitation. The technical impact of this vulnerability is that an authenticated local user can read or overwrite the legacy log entries of other accounts, potentially leading to unauthorized access and modification of login records.

Defensive priority

Defenders should prioritize verifying and updating Cockpit installations, especially on 32-bit systems, and monitor for unusual login record modifications.

Recommended defensive actions

• Verify and update Cockpit installations, especially on 32-bit systems
• Monitor for unusual login record modifications
• Implement additional logging and monitoring to detect potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the integer overflow vulnerability in Cockpit, which allows unauthorized modification and disclosure of login records. The vulnerability is particularly concerning on 32-bit systems where the integer overflow can lead to unauthorized access and modification of login records. Defenders should verify and update Cockpit installations, especially on 32-bit systems, and monitor for unusual login record modifications. The evidence from the CVE record and source item indicates that the vendor

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.