CVE-2026-98501 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, especially those using the affected HID: alps module, should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations

Why it matters

A use-after-free vulnerability in the Linux kernel's HID: alps module can cause system crashes or unexpected behavior. Defenders should prioritize patching or mitigation, especially in systems using the affected Linux kernel version.

• Potential use-after-free errors can cause system crashes or unexpected behavior
• Successful exploitation could lead to denial-of-service or elevation of privileges
• Defenders should verify input device registration and handling in the Linux kernel
• Patching or mitigating this vulnerability can prevent potential use-after-free errors

Technical summary

The Linux kernel's HID: alps module has a use-after-free vulnerability. When input2 registration fails, the input device is freed, but data->input2 still points to the freed memory. This can cause a potential use-after-free error when a U1_SP_ABSOLUTE_REPORT_ID report is received. The fix involves only storing input2 into drvdata after successful registration and adding a NULL guard in the raw_event path.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in systems using the affected Linux kernel version.

Recommended defensive actions

• Patch or update the Linux kernel to a version that includes the fix
• Review and update input device registration and handling in the Linux kernel
• Monitor for potential use-after-free errors in the Linux kernel
• Verify input device registration and handling in the Linux kernel
• 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 CVE record and NVD entry provide details on the vulnerability, but do not specify affected or fixed versions. The Linux kernel source code references are provided, but no additional information on exploitation or impact is available.

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.