CVE-2026-98088 Linux CVE debrief

Who should care

Linux kernel administrators, system administrators managing NUMA configurations, and security teams responsible for Linux kernel patch management should assess exposure and apply patches.

Why it matters

CVE-2026-98088 is a Linux kernel vulnerability that requires patching to prevent potential local denial-of-service or information disclosure. Defenders should verify and apply patches, especially on systems with NUMA configurations or using mpt3sas. Evidence is limited to CVE and NVD records, with specific exploitation details unknown.

• Potential local denial-of-service due to out-of-bounds array read.
• Possible information disclosure from sensitive data in NUMA node configurations.
• Verification priority for Linux kernel patch levels and system configurations.
• Exposure assessment for systems using mpt3sas with NUMA setups.

Technical summary

The Linux kernel vulnerability CVE-2026-98088 involves an out-of-bounds cpumask_of_node() call in _base_assign_reply_queues() due to dev_to_node() returning NUMA_NO_NODE (-1) on systems without NUMA topology information. The fix involves falling back to cpu_online_mask when no NUMA node is available. This issue arises when dev_to_node() returns NUMA_NO_NODE (-1) on systems without NUMA topology information, such as single-socket boards. The vulnerability has been fixed with a fallback to cpu_online_mask when no NUMA node is available, preventing potential local denial-of-service or information disclosure.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel systems, especially those with NUMA configurations or using mpt3sas, to prevent potential local denial-of-service or information disclosure.

Recommended defensive actions

• Verify and apply Linux kernel patches for mpt3sas, especially on systems with NUMA configurations.
• Review system configurations and NUMA setups for potential exposure.
• Monitor Linux kernel updates and apply patches promptly.
• Perform vulnerability assessment for systems using mpt3sas with NUMA setups.
• 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.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its resolution in the Linux kernel. However, specific exploitation details or affected versions beyond the Linux kernel are not provided.

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.