CVE-2026-98499

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()

The ‘wacom_wac_pen_serial_enforce()’ function may calculate and pass an invalid offset to hid_field_extract(), resulting in memory reads at incorrect addresses – possibly beyond the end of the report. If a field in the HID descriptor lists more usages than its Report Count actually reserves space for, the function’s inner ‘j’ will walk past the end of the field:

for (i = 0; i < report->maxfield; i++) { for (j = 0; j < report->field[i]->maxusage; j++) { … value = hid_field_extract(hdev, raw_data + 1, offset + j * size, size);

A descriptor listing 12288 usages against Report Count 1 has the loop extract the usage at index 12287 from bit offset 98296 – about 12 KB past a 2-byte received report. The value is stored in wacom_wac->serial[0] and can reach userspace as an MSC_SERIAL event, making this an information disclosure.

Clamp the loop to field->report_count, the number of value slots the report holds. Value slots past the last declared usage are still scanned; they reuse that usage (HID 1.11, 6.2.2.8).

Verified on v6.12.105 with a UHID reproducer: a 2-byte report from such a descriptor trips KASAN before the patch and not after it.

Affected product:

AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , Debian 10 ELS , Debian 11 ELS , Oracle Linux 7 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 20.04 ELS

Affected packages:

kernel @ 5.10.0 (+11 more)

Live-patch status from KernelCare for each operating system.