CVE-2025-38520: drm/amdkfd: Don't call mmput from MMU notifier callback

mediumCVSS 5.5CVE-2025-38520

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: Calling mmput() from an MMU notifier callback in the AMD KFD driver causes potential deadlock or memory corruption.
Who is affected: Systems with AMD GPUs using KFD (Kernel Fusion Driver) with active MMU notification callbacks.
Urgency: Medium severity (CVSS 5.5) with potential for system hang or corruption; not currently exploited.
Action: Apply Linux kernel patch to defer mmput() outside MMU notifier callback context.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38520

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2025-385200.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-38520	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund

Recent advisories for drm/amdkfd

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-74448: In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix QID bit le…nvd · 2026-08-15
highCVE-2026-74447: In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix uint32_t o…nvd · 2026-08-15
highCVE-2026-74446: In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: hold event_mut…nvd · 2026-08-15
unknownCVE-2026-74353: In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: always resume_…nvd · 2026-08-15
highCVE-2026-72449: In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix list_del c…nvd · 2026-08-15
highCVE-2026-68447: In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: clamp v9 CRIU …nvd · 2026-08-12