CVE-2026-93189 is a vulnerability in Linux Kernel
Published on September 17, 2026
HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
In the Linux kernel, the following vulnerability has been resolved:
HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
A driver's probe calls hid_device_io_start() to enable input delivery,
then fails at a later initialization step and unwinds via hid_hw_stop().
The unwind frees struct hidraw via hidraw_disconnect() while in-flight
HID reports may still be running on another CPU, dereferencing the
freed object through hidraw_report_event(). syzbot reports the
resulting use-after-free for the corsair-psu HID driver.
Edward Adam Davis posted a per-driver fix for corsair-psu that adds
an explicit hid_device_io_stop() before hid_hw_stop() in the probe
error path ("hwmon: prevent packets from going to driver for probe",
2026-04-28). Auditing the tree shows 15 drivers call
hid_device_io_start(); 7 also call hid_device_io_stop() and 8 do not:
drivers calling hid_device_io_start() without a matching
hid_device_io_stop() before hid_hw_stop():
drivers/hwmon/corsair-psu.c (fix posted by Edward)
drivers/hwmon/corsair-cpro.c
drivers/hwmon/nzxt-kraken3.c
drivers/hwmon/nzxt-smart2.c
drivers/hwmon/gigabyte_waterforce.c
drivers/hid/hid-logitech-dj.c
drivers/hid/hid-nintendo.c
drivers/hid/hid-mcp2221.c
Roughly half of all callers of the API are exposed. Centralize the
quiesce in hid_hw_stop() so callers do not have to remember the
matching stop: if a driver has left hdev->io_started true on entry,
call hid_device_io_stop() before hid_disconnect().
For the 7 drivers that already call hid_device_io_stop() correctly,
hdev->io_started is false on entry, the guard short-circuits, and
behavior is unchanged.
No Fixes: tag because the affected drivers gained their
hid_device_io_start() calls independently over years; the bug is a
class-wide API misuse rather than a regression from one commit.
Products Associated with CVE-2026-93189
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 0744cb9520aade37e78f69134f3111086158f1d2 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c876c437d188911685d8bed645416f2e86bd0354 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 6787f1828f5616f17250e108c0031fb96fd2cfe6 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 92cca302a4eaf65d1b38b3fb600b4ee5eb856a51 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 02246d8b462fd9bd90bc7ae7d6cab1acf69bcb87 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 544ebb25bd58f67e821573412ab7a982b9e02211 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 0fecd89f979a8653b9a5b0816570329b7a94a081 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a4bc41504690b7d7064931909874f5b98cd148b6 is affected.
- Before 5.10.270 is affected.
- Before 5.15.221 is affected.
- Before 6.1.188 is affected.
- Before 6.6.157 is affected.
- Before 6.12.110 is affected.
- Before 6.18.52 is affected.
- Before 7.2.6 is affected.
- Version 5.10.270, <= 5.10.* is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.6, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.