Bug 2555000 (CVE-2026-98645) - CVE-2026-98645 kernel: HID: winwing: fix use-after-free in force feedback teardown
Summary: CVE-2026-98645 kernel: HID: winwing: fix use-after-free in force feedback tea...
Keywords:
Status: NEW
Alias: CVE-2026-98645
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-18 15:38 UTC by OSIDB Bzimport
Modified: 2026-10-21 19:06 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-10-18 15:38:22 UTC
In the Linux kernel, the following vulnerability has been resolved:

HID: winwing: fix use-after-free in force feedback teardown

winwing_init_ff() passes the driver's private data, allocated with
devm_kzalloc() in winwing_probe(), as the effect context to
input_ff_create_memless(). The memoryless force-feedback core takes
ownership of that pointer and frees it with kfree() from
input_ff_destroy() (ml_ff_destroy()) when the input device is
destroyed.

Freeing a devm-managed allocation with kfree() is an invalid free, and
the same object is then released again by devres when the HID device is
torn down, a double free. As the allocation also embeds the LED class
devices, their timers and work item live on freed memory and the slab
gets corrupted. This triggers on unbind, rmmod, hot-unplug and on system
suspend, where the firmware cache walks the now-corrupt devres list.
KASAN reports:

  BUG: KASAN: invalid-free in input_ff_destroy
  Allocated by task N:
    winwing_probe

Pass NULL as the memless context instead and fetch the driver data from
the input device in winwing_play_effect(): the HID core already stores
the hid_device as the input device's drvdata. The force-feedback core
then owns nothing that it must not free.


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