CVE-2026-64100

System hang via recursive reservation locking

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper locking in the MSM DRM shrinker in Linux Kernel 6.17 allows local users to hang the system during VM reclaim pressure. msm_gem_shrinker_scan calls dma_resv_lock while kswapd already holds fs_reclaim, causing the reservation lock path to reacquire fs_reclaim and form a circular dependency. Exploitation requires local low-privileged access, an MSM GPU path, and reclaim pressure; successful triggering blocks kernel progress and interrupts system availability.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the MSM DRM shrinker in Linux Kernel 6.17 allows local users to hang the system during VM reclaim pressure. msm_gem_shrinker_scan calls dma_resv_lock while kswapd already holds fs_reclaim, causing the reservation lock path to reacquire fs_reclaim and form a circular dependency. Exploitation requires local low-privileged access, an MSM GPU path, and reclaim pressure; successful triggering blocks kernel progress and interrupts system availability.

The record

CVE
CVE-2026-64100
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.17
  2. Affected versionversion=fe4952b5f27cca5d143d3de249562d4cc984c1d6 <3392291fc509d8ad6e4ad90f15b0a193f721cbc9
  3. Affected versionversion=fe4952b5f27cca5d143d3de249562d4cc984c1d6 <928788566c79046f71a211fc32c115400be76402
  4. Affected versionversion=fe4952b5f27cca5d143d3de249562d4cc984c1d6 <942968260e61d4a5d7552b20814b6277f9c553df

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=fe4952b5f27cca5d143d3de249562d4cc984c1d6 <3392291fc509d8ad6e4ad90f15b0a193f721cbc9; version=fe4952b5f27cca5d143d3de249562d4cc984c1d6 <928788566c79046f71a211fc32c115400be76402; version=fe4952b5f27cca5d143d3de249562d4cc984c1d6 <942968260e61d4a5d7552b20814b6277f9c553df

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-667Improper Locking
T1499Endpoint Denial of Service

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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