CVE-2026-31606

Local kernel oops via stale HID cdev

Published Apr 24, 2026 · Updated Apr 24, 2026

Stale character-device handling in affected Linux Kernel releases allows local users to trigger a kernel oops during HID gadget rebinding. In hidg_bind, cdev_init reinitializes an embedded cdev after unbind even while an open /dev/hidg* descriptor retains references to it. The HID gadget must be configured and its character device must remain open across an unbind-and-bind sequence; the resulting oops interrupts service.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stale character-device handling in affected Linux Kernel releases allows local users to trigger a kernel oops during HID gadget rebinding. In hidg_bind, cdev_init reinitializes an embedded cdev after unbind even while an open /dev/hidg* descriptor retains references to it. The HID gadget must be configured and its character device must remain open across an unbind-and-bind sequence; the resulting oops interrupts service.

The record

CVE
CVE-2026-31606
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a229016ca3ac551294ec59770be9da94ec4bf63
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75ecc46828ec377dd5692c677168ef6d64fd7123
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6c0d13db5d0f8d465eabc14bd23d2b6a7247a43
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eb6ef6185f2054a341ec70d7e2165f5381744215

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a229016ca3ac551294ec59770be9da94ec4bf63; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75ecc46828ec377dd5692c677168ef6d64fd7123; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6c0d13db5d0f8d465eabc14bd23d2b6a7247a43; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eb6ef6185f2054a341ec70d7e2165f5381744215

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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