CVE-2026-64299 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security should assess exposure and prioritize patching to prevent potential exploitation. This includes verifying the Linux kernel version, applying patches, and monitoring system logs for potential exploitation attempts. Additionally, defenders should implement additional security measures to prevent KASAN slab-out-of-bounds reads and review compensating controls for exposed systems while remediation is scheduled.

Why it matters

CVE-2026-64299 is a Linux kernel vulnerability that allows for an out-of-bounds read in glob matching. Defenders should prioritize verifying the Linux kernel version and applying patches to prevent potential exploitation.

• Verify Linux kernel version to determine potential exposure
• Apply patches to prevent potential exploitation
• Monitor system logs for potential exploitation attempts
• Implement additional security measures to prevent KASAN slab-out-of-bounds reads

Technical summary

The Linux kernel vulnerability CVE-2026-64299 allows for an out-of-bounds read in glob matching due to the regex_match_glob() function ignoring the length of string event fields. This can lead to a KASAN slab-out-of-bounds read. The vulnerability affects Linux kernel deployments and defenders should assess exposure and prioritize patching to prevent potential exploitation. The CVE record and source item provide details on the vulnerability, including its cause and potential impact. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Defensive priority

Defenders should prioritize verifying the Linux kernel version and applying patches to prevent potential exploitation.

Recommended defensive actions

• Verify Linux kernel version and apply patches
• Monitor system logs for potential exploitation attempts
• Implement additional security measures to prevent KASAN slab-out-of-bounds reads
• 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 vulnerability, including its cause and potential impact. However, there is limited information on potential exploitation or affected systems. Defenders should verify the Linux kernel version and apply patches to prevent potential exploitation. The vulnerability has been resolved in the Linux kernel, and defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

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.