HID: universal-pidff: stop the device when force-feedback init fails
CVE-2026-89624 · published 11 Sept 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-89624?
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Who is affected
- Linux Linux: c1fde337b317f0a226de92803288741c30799eb0 to < 66358f5789c9a7e28809985a83c01e6ad933849e, f45f26a6b3e7260c129c7c6bb0ace63aeb7b3868 to < 519fa26695b02870022fcdc651efb3d379abe54e, f06bf8d94fffbb544b1cb5402c92e0a075f0d420 to < 01d9874e84d3ab78fd212ad822412eb3af84497f, f06bf8d94fffbb544b1cb5402c92e0a075f0d420 to < c457bb516b61edeab940235a011928e26925381e
- Linux Linux: 6.15
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
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- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
HID: universal-pidff: stop the device when force-feedback init fails
universal_pidff_probe() starts the device with hid_hw_start() and then, if
force-feedback initialisation fails, returns the error through a label that
only does "return error". The device is left started.
The HID core does not unwind on the driver's behalf. __hid_device_probe()
releases the devres group, closes the report and clears hdev->driver:
if (ret) {
devres_release_group(&hdev->dev, hdev->devres_group_id);
hid_close_report(hdev);
hdev->driver = NULL;
}
The hidraw character device that hid_hw_start() registered through
hid_connect() is allocated with kzalloc() and added with cdev_device_add(),
so it is not devres-managed and survives that. With hdev->driver NULL,
hid_device_remove() skips hid_hw_stop() as well, because it only unwinds
while a driver is still attached. The registration therefore outlives the
device on both paths.
Opening the surviving /dev/hidrawX writes into freed memory. KASAN reports
a use-after-free write from hidraw_open() -> hid_hw_open() -> the
transport's open callback, which takes a spinlock inside the freed object.
A descriptor that carries a PID usage page and no input reports is enough:
hidraw claims the device so hid_hw_start() succeeds, while hid->inputs
stays empty so force-feedback init fails. The other failure returns in
hid_pidff_init_with_quirks() - no output reports, an allocation failure,
pidff_init_fields(), pidff_check_autocenter(), an unusable effect count,
input_ff_create() - all reach the same label.
Stop the device on that path. hid-dr.c and hid-emsff.c, which start the
device with the same HID_CONNECT_DEFAULT & ~HID_CONNECT_FF mask, already do
this. The two earlier gotos must keep returning without hid_hw_stop(),
since neither has a started device, so give the path that fails after the
start its own label.
Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
Check your whole app
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References
- git.kernel.org/stable/c/66358f5789c9a7e28809985a83c01e6ad933849e
- git.kernel.org/stable/c/519fa26695b02870022fcdc651efb3d379abe54e
- git.kernel.org/stable/c/01d9874e84d3ab78fd212ad822412eb3af84497f
- git.kernel.org/stable/c/c457bb516b61edeab940235a011928e26925381e
- git.kernel.org/stable/c/ce08c5555cabcd444d8b77fa69a7cb68bb05f611
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON