CVE-2025-39772

Kernel crash via premature hibmc cleanup

Published Sep 11, 2025 · Updated Sep 11, 2025

NULL pointer dereference in the Linux hibmc DRM driver from 4.14 allows local users to crash the kernel after device initialization fails. The hibmc_load error path calls hibmc_unload after hibmc_hw_init fails, before mode.config mutexes are initialized, so cleanup dereferences a null mutex pointer. Reachability requires local low-privileged access and a HiSilicon hibmc device whose initialization fails; successful triggering crashes the kernel and interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.14%
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 hibmc DRM driver from 4.14 allows local users to crash the kernel after device initialization fails. The hibmc_load error path calls hibmc_unload after hibmc_hw_init fails, before mode.config mutexes are initialized, so cleanup dereferences a null mutex pointer. Reachability requires local low-privileged access and a HiSilicon hibmc device whose initialization fails; successful triggering crashes the kernel and interrupts the host.

The record

CVE
CVE-2025-39772
Published
Sep 11, 2025
Updated
Sep 11, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=4.14
  2. Affected versionversion=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <93a08f856fcc5aaeeecad01f71bef3088588216a
  3. Affected versionversion=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <a4f1b9c57092c48bdc7958abd23403ccaed437b2
  4. Affected versionversion=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <c950e1be3a24d021475b56efdb49daa7fbba63a9
  5. Affected versionversion=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <d3e774266c28aefab3e9db334fdf568f936cae04
  6. Affected versionversion=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <ddf1691f25345699296e642f0f59f2d464722fa3
  7. Affected versionversion=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <f93032e5d68f459601c701f6ab087b5feb3382e8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <93a08f856fcc5aaeeecad01f71bef3088588216a; version=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <a4f1b9c57092c48bdc7958abd23403ccaed437b2; version=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <c950e1be3a24d021475b56efdb49daa7fbba63a9; version=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <d3e774266c28aefab3e9db334fdf568f936cae04; version=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <ddf1691f25345699296e642f0f59f2d464722fa3; version=b3df5e65cc03696b0624a877d03a3ddf3ef43f52 <f93032e5d68f459601c701f6ab087b5feb3382e8

Published CVSS scores

5.5NIST NVDCVSS: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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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