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Linux KernelOperating system · Linux

CVE-2026-31722

MEDIUM · 5.5 CVSS v3.1 Published 2026-05-01
Fix available
A fix is available. Upgrade to 6.12.81 / 6.18.22 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_rndis: Fix net_device lifecycle with device_move The net_device is allocated during function instance creation and registered during the bind phase with the gadget device as its sysfs parent. When the function unbinds, the parent device is destroyed, but the net_device survives, resulting in dangling sysfs symlinks: console:/ # ls -l /sys/class/net/usb0 lrwxrwxrwx ... /sys/class/net/usb0 -> /sys/devices/platform/.../gadget.0/net/usb0 console:/ # ls -l /sys/devices/platform/.../gadget.0/net/usb0 ls: .../gadget.0/net/usb0: No such file or directory Use device_move() to reparent the net_device between the gadget device tree and /sys/devices/virtual across bind and unbind cycles. During the final unbind, calling device_move(NULL) moves the net_device to the virtual device tree before the gadget device is destroyed. On rebinding, device_move() reparents the device back under the new gadget, ensuring proper sysfs topology and power management ordering. To maintain compatibility with legacy composite drivers (e.g., multi.c), the borrowed_net flag is used to indicate whether the network device is shared and pre-registered during the legacy driver's bind phase.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 3.11, < 6.12.81>= 6.13, < 6.18.22>= 6.19, < 6.19.12= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.12.81 / 6.18.22 / 6.19.12 or later
Fixed in 6.12.816.18.226.19.12
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to kernel 6.12.81 (or later 6.12.x), 6.18.22 (or later 6.18.x), or 6.19.12 (or later 6.19.x) depending on your current branch

  1. 1. Identify the current running kernel version using `uname -r`
  2. 2. Determine the appropriate target kernel version based on your current branch: for 6.12.x series upgrade to >= 6.12.81, for 6.13.x-6.17.x upgrade to >= 6.18.22, for 6.19.x upgrade to >= 6.19.12
  3. 3. Apply the vendor kernel update via your distribution's package manager (e.g., `apt update && apt upgrade`, `yum update`, or `dnf upgrade`)
  4. 4. Reboot the system to load the patched kernel
  5. 5. After reboot, verify the fix is applied by checking the kernel version with `uname -r` and confirming it meets the minimum fixed version for your branch
  6. 6. Test USB RNDIS gadget functionality to ensure the network device works correctly
Caveat Minor - this is a bug fix for sysfs topology; no functional breaking changes expected for USB RNDIS gadget usage

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-31722 in production — separate from our analysis above.

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