# CVE-2026-93826: Linux kernel HID subsystem use-after-free in hidpp_connect_event

Source: https://junglewise.ai/threats/cve-2026-93826-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93826 · Severity: high · CVSS 7.5 · Published 2026-09-24

The Linux kernel's HID (Human Interface Device) subsystem, which handles input devices like keyboards and mice, contains a use-after-free vulnerability in the Logitech HID++ driver. If device input registration fails, the driver frees the device but retains a stale pointer, which could be dereferenced later, potentially allowing an attacker to read memory or cause a kernel crash.

Technologies: [Linux kernel](https://junglewise.ai/threats/technologies/x-linux-kernel).

## Quick answers

**Is CVE-2026-93826 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93826 being exploited in the wild.

**How severe is CVE-2026-93826?** High severity, with a CVSS score of 7.5, published 24 September 2026.

**Which products and versions are affected?** Linux kernel multiple versions (fix backported to stable branches).

**Is there a fix for CVE-2026-93826?** A patch was published on 2026-06-12: Upstream fix committed by Jiri Kosina Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-93826 attacked?** It is attacked with local access or from the adjacent network, in an operating system.

**Am I affected by CVE-2026-93826?** Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A use-after-free exists in hidpp_connect_event() in drivers/hid/hid-logitech-hidpp.c: when input_register_device() fails, input_free_device() is called but the hidpp->input pointer is not cleared, leaving a dangling reference to freed memory. An attacker with local access to trigger device connection events (by plugging in a specially crafted HID device) could dereference the stale pointer. The fix resets the pointer to NULL before returning from the error path.

## Affected products

- Linux kernel multiple versions (fix backported to stable branches)

## Timeline

- 2026-09-24: disclosed: Published on NVD
- 2026-06-12: patched: Upstream fix committed by Jiri Kosina

## References

- [https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3](https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3)
- [https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133](https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133)

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