CVE-2026-98648 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers responsible for maintaining and securing Linux-based systems should assess exposure and prioritize verification of affected systems.

Why it matters

The Linux kernel s390/uv component has a potential out-of-bounds read vulnerability that requires verification of affected systems, especially those with more than 85 secrets. Linux system administrators and security teams should assess exposure and prioritize verification and patching of affected systems.

• Verification of Linux kernel configurations and versions is required to determine if systems are affected.
• Assessment of the number of secrets stored on systems is necessary to determine potential exposure.
• Prioritization of patching or updating Linux kernel versions to resolve the vulnerability is crucial.
• Monitoring of system logs for potential exploitation attempts is recommended.

Technical summary

The Linux kernel s390/uv component has a potential out-of-bounds read vulnerability. When the system has more than 85 secrets, the uv_secret_list struct array only holds up to 85 items per page, resulting in an out-of-bounds read in find_secret_in_page if the targeted secret is in the next page or not stored at all. The vulnerability has been resolved by looping over the number of stored secrets, which is the per sub-list count of stored secrets, not the overall count.

Defensive priority

Linux system administrators and security teams should assess exposure and prioritize verification of affected systems, especially those with more than 85 secrets.

Recommended defensive actions

• Review Linux kernel configurations and versions to determine if systems are affected.
• Verify the number of secrets stored on systems and assess potential exposure.
• Apply patches or updates provided by the Linux kernel maintainers to resolve the vulnerability.
• Monitor system logs for potential exploitation attempts.
• Perform an inventory of assets that may be affected by this vulnerability.
• Establish a rollback plan in case patching is not immediately feasible.
• Track and verify the patch deployment process for affected systems.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the actual impact and affected versions require verification from the Linux kernel maintainers and official sources. Linux system administrators and security teams should verify the number of secrets stored on systems and assess potential exposure. They should also review Linux kernel configurations and versions to determine if systems are affected. Additionally, they should apply patches or updates provided by the Linux kernel maintainers to resolve the potential

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.