CVE-2026-98483 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators should assess exposure and prioritize patching to prevent potential use-after-free exploitation. Linux kernel deployments should be reviewed for exposure, and patching should be prioritized to ensure safe lifetime management of NFC component resources. Operators, platform administrators, and security teams should verify patch application and assess the impact of this vulnerability on their environments.

Why it matters

A use-after-free vulnerability in the Linux kernel's NFC component has been addressed. Linux kernel maintainers and users should assess exposure and prioritize patching to prevent potential use-after-free exploitation.

• Verify patch application to prevent potential use-after-free exploitation.
• Assess exposure of Linux kernel deployments to this vulnerability.
• Prioritize patching to ensure safe lifetime management of NFC component resources.

Technical summary

The Linux kernel's NFC component had a use-after-free vulnerability in the `nfc_get_local_general_bytes` function. This was caused by accessing the `local->gb` pointer after the reference count dropped to zero. The issue has been resolved by refactoring `nfc_llcp_general_bytes` and `nfc_get_local_general_bytes` to accept a caller-provided output buffer, ensuring safe lifetime management. This fix prevents potential use-after-free exploitation by safely copying the general bytes into the output buffer before calling `nfc_llcp_local_put(local)`.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize patching to prevent potential use-after-free exploitation.

Recommended defensive actions

• Review and apply the provided kernel patches to ensure safe lifetime management of NFC component resources.
• Assess exposure of Linux kernel deployments to this vulnerability and prioritize patching accordingly.
• Monitor NFC component usage and verify patch application to prevent potential use-after-free exploitation.
• Verify patch application to prevent potential use-after-free exploitation.
• Assess exposure of Linux kernel deployments to this vulnerability.
• Prioritize patching to ensure safe lifetime management of NFC component resources.
• Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE record and associated source references provide details on the vulnerability and its fix. However, specific exploitation instances or victim information are not provided. To verify patch application, defenders should review the Linux kernel's NFC component usage, assess exposure of Linux kernel deployments to this vulnerability, and prioritize patching to ensure safe lifetime management of NFC component resources. The fix involves refactoring `nfc_llcp_general_bytes` and `nfc_get_local_general_bytes` to accept a caller-provied

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.