CVE-2026-98582 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those with NFC support enabled, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify and apply patches, review and update NFC-enabled configurations, and monitor Linux kernel updates and security advisories to ensure the security of their systems.

Why it matters

This vulnerability in the Linux kernel's NFC implementation could lead to buffer over-reads or improper CRC processing. Defenders should prioritize verifying and applying patches, reviewing and updating NFC-enabled configurations, and monitoring Linux kernel updates.

• Verify and prioritize patching for Linux kernel versions affected by this vulnerability
• Assess and update NFC-enabled Linux kernel configurations
• Monitor Linux kernel updates and security advisories for potential impacts

Technical summary

The st21nfca_hci_i2c_repack function in the Linux kernel's NFC implementation did not properly validate received frame sizes, leading to potential buffer over-reads or improper CRC processing. This issue has been resolved by requiring minimum framing bytes before and after unstuffing and using separate input and output cursors while removing byte stuffing. Affected Linux kernel-based systems with NFC support enabled should be assessed for exposure and prioritized for patching to prevent potential exploitation. The CVE record and associated source references provide details on the vulnerability and its resolution.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly those with NFC support enabled.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by this vulnerability
• Review and update NFC-enabled Linux kernel configurations
• Monitor Linux kernel updates and security advisories
• Assess exposure of Linux kernel-based systems with NFC support enabled
• Prioritize patching for Linux kernel versions affected by this vulnerability
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and associated source references provide details on the vulnerability and its resolution. However, specific version ranges of the Linux kernel affected by this issue 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.