CVE-2025-40332

System hang via mismatched mmap lock release

Published Dec 9, 2025 · Updated May 23, 2026

Denial of service in affected Linux kernel releases allows local users to hang the system while draining an AMD KFD retry fault. In drivers/gpu/drm/amd/amdkfd/kfd_svm.c, svm_range_restore_pages releases a read lock after its caller acquired the mmap write lock, leaving the write lock held on return. Reachability requires local access to the AMD KFD shared-virtual-memory retry-fault path; later mmap readers or writers deadlock, hanging the system.

CVSS severity0.0
None
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux kernel releases allows local users to hang the system while draining an AMD KFD retry fault. In drivers/gpu/drm/amd/amdkfd/kfd_svm.c, svm_range_restore_pages releases a read lock after its caller acquired the mmap write lock, leaving the write lock held on return. Reachability requires local access to the AMD KFD shared-virtual-memory retry-fault path; later mmap readers or writers deadlock, hanging the system.

The record

CVE
CVE-2025-40332
Published
Dec 9, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=177660d7ecb34298dab5f0d1efc7e8b02f934551
  2. Affected versionversion=5a3c09bd25cc0a55ec9c048710d379fa2c84b4e7
  3. Affected versionversion=6.12.24 <6.12.58
  4. Affected versionversion=6.13.12 <6.14
  5. Affected versionversion=6.14.3 <6.15
  6. Affected versionversion=6.15
  7. Affected versionversion=e64be12f8401819662e608efa247638b61d023cd <e2105ba1c262dcaa9573f11844b6e1e1ca762c3f
  8. Affected versionversion=f844732e3ad9c4b78df7436232949b8d2096d1a6 <7574f30337e19045f03126b4c51f525b84e5049e
  9. Affected versionversion=f844732e3ad9c4b78df7436232949b8d2096d1a6 <f7569ef1cf978aa87aa81b5e9bf40a77497f3685

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=177660d7ecb34298dab5f0d1efc7e8b02f934551; version=5a3c09bd25cc0a55ec9c048710d379fa2c84b4e7; version=6.12.24 <6.12.58; version=6.13.12 <6.14; version=6.14.3 <6.15; version=6.15; version=e64be12f8401819662e608efa247638b61d023cd <e2105ba1c262dcaa9573f11844b6e1e1ca762c3f; version=f844732e3ad9c4b78df7436232949b8d2096d1a6 <7574f30337e19045f03126b4c51f525b84e5049e; version=f844732e3ad9c4b78df7436232949b8d2096d1a6 <f7569ef1cf978aa87aa81b5e9bf40a77497f3685

Published CVSS scores

0.0Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N

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

T1499.004Application 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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