CVE-2025-39808

System crash via unchecked HID parent pointer

Published Sep 16, 2025 · Updated Sep 16, 2025

NULL pointer dereference in the Linux kernel hid-ntrig driver allows local users to crash the system via a crafted /dev/uhid descriptor. ntrig_report_version() calls hid_to_usb_dev() without first verifying hdev->dev.parent->parent, so usb_rcvctrlpipe() dereferences an invalid usb_dev address. Access to /dev/uhid and the hid-ntrig driver is required; exploitation causes a kernel page fault and system crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel hid-ntrig driver allows local users to crash the system via a crafted /dev/uhid descriptor. ntrig_report_version() calls hid_to_usb_dev() without first verifying hdev->dev.parent->parent, so usb_rcvctrlpipe() dereferences an invalid usb_dev address. Access to /dev/uhid and the hid-ntrig driver is required; exploitation causes a kernel page fault and system crash without data disclosure or modification.

The record

CVE
CVE-2025-39808
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record 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 <019c34ca11372de891c06644846eb41fca7c890c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <183def8e4d786e50165e5d992df6a3083e45e16c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <185c926283da67a72df20a63a5046b3b4631b7d9
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <22ddb5eca4af5e69dffe2b54551d2487424448f1
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4338b0f6544c3ff042bfbaf40bc9afe531fb08c7
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6070123d5344d0950f10ef6a5fdc3f076abb7ad2
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98520a9a3d69a530dd1ee280cbe0abc232a35bff
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e422370e6ab28478872b914cee5d49a9bdfae0c6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <019c34ca11372de891c06644846eb41fca7c890c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <183def8e4d786e50165e5d992df6a3083e45e16c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <185c926283da67a72df20a63a5046b3b4631b7d9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <22ddb5eca4af5e69dffe2b54551d2487424448f1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4338b0f6544c3ff042bfbaf40bc9afe531fb08c7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6070123d5344d0950f10ef6a5fdc3f076abb7ad2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98520a9a3d69a530dd1ee280cbe0abc232a35bff; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e422370e6ab28478872b914cee5d49a9bdfae0c6

Published CVSS scores

5.5Oracle LinuxCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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