CVE-2026-98576 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using NFC LLCP functionality, should assess exposure and prioritize patching or mitigation efforts. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify Linux kernel versions, review system configurations, and monitor system logs for potential exploitation attempts.

Why it matters

CVE-2026-98576 is a vulnerability in the Linux kernel's NFC LLCP implementation that can cause slab-out-of-bounds reads. Defenders should prioritize verifying and applying patches, particularly in systems using NFC LLCP functionality, to prevent potential DoS or information disclosure.

• Potential for denial of service (DoS) or information disclosure due to slab-out-of-bounds reads
• Need for verification of Linux kernel versions and patch application
• Potential impact on system stability and security if left unpatched

Technical summary

The Linux kernel's NFC LLCP implementation is vulnerable to slab-out-of-bounds reads when logging service names. This occurs because the pr_debug() function is called with non-null-terminated strings, which can lead to reads beyond the allocated buffer. The issue has been resolved by modifying the call sites to use %.*s with the explicit length to limit the output to the actual length of the string.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly in systems using NFC LLCP functionality.

Recommended defensive actions

• Verify Linux kernel versions in use and check for patches or updates addressing this vulnerability
• Review system configurations and NFC LLCP implementations for potential exposure
• Monitor system logs for indicators of potential exploitation attempts
• Apply patches or updates to Linux kernel versions affected by this vulnerability
• 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 associated references provide details on the vulnerability, including its description, affected components, and resolution. However, specific version ranges of the Linux kernel affected by this vulnerability are not provided in the supplied corpus.

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.