CVE-2026-98499: HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
HID: wacom: fix OOB read in wacomwacpenserialenforce()
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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Fixed in 6.6.159.1-1 - Upgrade
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ubuntu/linux-hwe-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42~24.04.1 - Upgrade
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ubuntu/linux-riscv-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1~24.04.1 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1016.17 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1016.18 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1 - Compensating control
In wacom_wac_pen_serial_enforce(), clamp the inner loop to field->report_count—the number of value slots the report holds—instead of iterating through field->maxusage, preventing out-of-bounds reads.
Event History
Frequently Asked Questions
What would an attacker need to exploit this issue?
An attacker would need to provide a malicious HID descriptor and report to the affected Wacom HID driver. The descriptor must declare more usages for a field than its Report Count reserves, causing the driver to read beyond the received report.
What is exposed if the vulnerability is exploited?
The out-of-bounds read can retrieve memory from incorrect addresses, potentially beyond the end of a HID report. The extracted value can be delivered to userspace as an MSC_SERIAL event, creating an information-disclosure path.
How can I determine whether a system is affected?
Review whether the system uses the Linux kernel Wacom HID driver and accepts or connects potentially untrusted HID devices or virtual HID devices. The issue is associated with wacom_wac_pen_serial_enforce() handling fields whose usage count exceeds their Report Count.
What is the mitigation if an update cannot be applied immediately?
Limit access to untrusted physical HID devices and prevent untrusted users or workloads from creating virtual HID devices, such as UHID devices. This reduces the opportunity to supply the malformed descriptor and report required to trigger the read.