CVE-2026-98575 Linux CVE debrief

Who should care

Linux kernel developers and administrators who use the NFC pn533 driver should review and apply the patch to prevent exploitation of this vulnerability. They should also restrict access to the driver to trusted devices and monitor for suspicious activity on NFC pn533 devices.

Why it matters

The Linux kernel NFC pn533 driver vulnerability allows for out-of-bounds reads, which can be exploited by malicious devices. Defenders should review and apply the patch, restrict access to the driver, and monitor for suspicious activity.

• Verify patch application to prevent out-of-bounds reads
• Restrict NFC pn533 driver access to trusted devices to limit potential exploitation
• Monitor for suspicious activity on NFC pn533 devices to detect potential attacks

Technical summary

The Linux kernel has a vulnerability in the NFC pn533 driver that allows for an out-of-bounds read. The vulnerability is caused by the unchecked use of the `datalen` field from a USB response frame as an index into a buffer. This can be exploited by a malicious device to cause the driver to read outside the received buffer. The patch adds bounds checking for the `datalen` field to prevent out-of-bounds reads. Affected Linux kernel developers and administrators should review and apply the patch to prevent exploitation.

Defensive priority

High

Recommended defensive actions

• Review and apply the Linux kernel patch for the NFC pn533 driver vulnerability
• Restrict access to the NFC pn533 driver to trusted devices
• Monitor for suspicious activity on NFC pn533 devices
• Verify patch application to prevent out-of-bounds reads
• 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 vulnerability is caused by the unchecked use of the `datalen` field from a USB response frame as an index into a buffer. The Linux kernel has patched this vulnerability. Evidence is limited to public CVE details and supplied source corpus. Defenders should verify patch application and monitor for suspicious activity on NFC pn533 devices.

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.