In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: don't call cdev_init while cdev in use When calling unbind,… (CVE-2026-31606)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: don't call cdev_init while cdev in use When calling unbind, then bind again, cdev_init reinitialized the cdev, even though there may still be references to it. That's the case when the /dev/hidg* device is still opened. This obviously unsafe behavior like oopes. This fixes this by using cdev_alloc to put the cdev on the heap. That way, we can simply allocate a new one in hidg_bind.
AI Analysis
Technical Summary
The Linux kernel USB gadget HID function (f_hid) had a vulnerability where calling cdev_init on a character device (cdev) that was still in use could cause unsafe behavior. Specifically, when the device was unbound and then rebound while the /dev/hidg* device was still open, cdev_init reinitialized the cdev despite existing references, leading to potential system instability or denial of service. The fix involved changing the allocation of the cdev to the heap using cdev_alloc, allowing safe reallocation during binding. This vulnerability affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions listed. The issue is tracked as CVE-2026-31606 with a CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), indicating a local attacker with low privileges can cause availability impact without affecting confidentiality or integrity. The vendor advisory from Ubuntu confirms the availability of patches in updated kernel packages and recommends rebooting after update.
Potential Impact
The vulnerability impacts system availability by causing unsafe behavior in the USB gadget HID function when the character device is reinitialized while still in use. This can lead to system instability or denial of service conditions. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in updated Linux kernel packages as per the Ubuntu security advisories USN-8488-1 and USN-8488-2. Users should update their systems to the fixed kernel versions listed in the advisories and reboot to apply the changes. Due to an ABI change, recompiling and reinstalling third-party kernel modules may be required. No additional mitigation actions are indicated by the vendor.
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: don't call cdev_init while cdev in use When calling unbind,… (CVE-2026-31606)
Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: don't call cdev_init while cdev in use When calling unbind, then bind again, cdev_init reinitialized the cdev, even though there may still be references to it. That's the case when the /dev/hidg* device is still opened. This obviously unsafe behavior like oopes. This fixes this by using cdev_alloc to put the cdev on the heap. That way, we can simply allocate a new one in hidg_bind.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel USB gadget HID function (f_hid) had a vulnerability where calling cdev_init on a character device (cdev) that was still in use could cause unsafe behavior. Specifically, when the device was unbound and then rebound while the /dev/hidg* device was still open, cdev_init reinitialized the cdev despite existing references, leading to potential system instability or denial of service. The fix involved changing the allocation of the cdev to the heap using cdev_alloc, allowing safe reallocation during binding. This vulnerability affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions listed. The issue is tracked as CVE-2026-31606 with a CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), indicating a local attacker with low privileges can cause availability impact without affecting confidentiality or integrity. The vendor advisory from Ubuntu confirms the availability of patches in updated kernel packages and recommends rebooting after update.
Potential Impact
The vulnerability impacts system availability by causing unsafe behavior in the USB gadget HID function when the character device is reinitialized while still in use. This can lead to system instability or denial of service conditions. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in updated Linux kernel packages as per the Ubuntu security advisories USN-8488-1 and USN-8488-2. Users should update their systems to the fixed kernel versions listed in the advisories and reboot to apply the changes. Due to an ABI change, recompiling and reinstalling third-party kernel modules may be required. No additional mitigation actions are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31606
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5b61de2d1edb114c8868cf
Added to database: 07/18/2026, 11:22:06 UTC
Last enriched: 08/01/2026, 05:16:23 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 21
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