CVE-2026-98579 Linux CVE debrief

Who should care

Linux kernel developers and maintainers should assess and apply the relevant patches. System administrators and security teams responsible for Linux-based systems, especially those using NFC functionality, should review their configurations and consider applying the patches or mitigations. Users of Linux distributions should also be aware of the vulnerability and ensure that their systems are updated with the latest kernel patches.

Why it matters

The CVE-2026-98579 vulnerability in the Linux kernel's NFC LLCP implementation can lead to memory leaks, potentially causing denial-of-service conditions or system instability if exploited. Linux kernel developers, system administrators, and security teams should assess exposure, apply patches, and monitor for potential exploitation attempts.

• Memory exhaustion could lead to denial-of-service conditions if an attacker can repeatedly trigger the memory leak.
• Successful exploitation might allow an attacker to cause system instability or crashes.
• The vulnerability could potentially be used as a vector for further exploitation in conjunction with other vulnerabilities.
• Verification of kernel versions and application of patches is necessary to mitigate the vulnerability.

Technical summary

The Linux kernel's NFC LLCP implementation has a vulnerability that can lead to a memory leak when parsing and sending SDREQ TLV lists. This occurs because the nfc_genl_llc_sdreq() function does not properly free allocated TLV nodes in three error paths. An attacker could potentially exploit this vulnerability to cause memory exhaustion, although the success of such an attack would depend on various factors, including the system's configuration and available resources.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the relevant kernel patches to fix the NFC LLCP memory leak vulnerability.
• Monitor system logs for potential exploitation attempts.
• Consider restricting access to NFC functionality if not required.
• Perform a thorough review of the system's configuration and ensure that all necessary patches are applied.
• Track exceptions and retest remediated assets to ensure the vulnerability is fully resolved.
• Assign an owner to follow up on the remediation process and ensure its completion.
• Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but do not specify which kernel versions are affected or provide CVSS scores. The Linux kernel maintainers have resolved the issue with several commits.

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.