In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: stop device IO before hid_hw_stop Quiesce device IO at the start… (CVE-2026-89623)
A use-after-free vulnerability in the Linux kernel's HID driver for the mcp2221 device has been resolved. The issue involved device IO not being properly quiesced before hardware teardown during probe failure or device removal, which could lead to race conditions. The fix ensures device IO is stopped before the hid_hw_stop call, preventing incoming HID reports from racing with hardware teardown. The patch also adds a guard to avoid spurious warnings during normal device removal.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel HID driver for the mcp2221 device was due to device IO not being quiesced at the start of the devm cleanup callback mcp2221_hid_unregister(). This allowed incoming HID reports to potentially race with hardware teardown during probe failure or device removal, creating a use-after-free condition. The fix involves stopping device IO before the hid_hw_stop call and guarding the call to hid_device_io_stop() with an io_started flag to avoid unnecessary warnings during normal removal while preserving correct behavior during probe failure.
Potential Impact
This vulnerability could lead to a use-after-free condition during device removal or probe failure, potentially causing kernel instability or crashes. There is no indication of known exploits in the wild. The impact is limited to the affected HID driver and scenarios involving device removal or probe failure.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to address this issue. Users should update to the fixed kernel version once it is released. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: stop device IO before hid_hw_stop Quiesce device IO at the start… (CVE-2026-89623)
Description
A use-after-free vulnerability in the Linux kernel's HID driver for the mcp2221 device has been resolved. The issue involved device IO not being properly quiesced before hardware teardown during probe failure or device removal, which could lead to race conditions. The fix ensures device IO is stopped before the hid_hw_stop call, preventing incoming HID reports from racing with hardware teardown. The patch also adds a guard to avoid spurious warnings during normal device removal.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel HID driver for the mcp2221 device was due to device IO not being quiesced at the start of the devm cleanup callback mcp2221_hid_unregister(). This allowed incoming HID reports to potentially race with hardware teardown during probe failure or device removal, creating a use-after-free condition. The fix involves stopping device IO before the hid_hw_stop call and guarding the call to hid_device_io_stop() with an io_started flag to avoid unnecessary warnings during normal removal while preserving correct behavior during probe failure.
Potential Impact
This vulnerability could lead to a use-after-free condition during device removal or probe failure, potentially causing kernel instability or crashes. There is no indication of known exploits in the wild. The impact is limited to the affected HID driver and scenarios involving device removal or probe failure.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to address this issue. Users should update to the fixed kernel version once it is released. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-p59v-m859-4ppq
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89623"]
Threat ID: 6aa4a00855bf5e2cf5a86651
Added to database: 09/12/2026, 00:42:48 UTC
Last enriched: 09/12/2026, 01:00:18 UTC
Last updated: 09/12/2026, 01:00:18 UTC
Views: 2
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