CVE-2025-39679

Local service interruption via leaked VMM arguments

Published Sep 5, 2025 · Updated Sep 5, 2025

Memory leak in the Linux kernel Nouveau NVIF VMM code allows local users to exhaust memory by supplying an invalid VMM type. The nvif_vmm_ctor function returns directly on an invalid nvif_vmm_type without freeing its allocated argument buffer. Low-privileged local access to the Nouveau VMM path is required; repeated invalid requests deplete memory and interrupt system availability.

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

What happened

Memory leak in the Linux kernel Nouveau NVIF VMM code allows local users to exhaust memory by supplying an invalid VMM type. The nvif_vmm_ctor function returns directly on an invalid nvif_vmm_type without freeing its allocated argument buffer. Low-privileged local access to the Nouveau VMM path is required; repeated invalid requests deplete memory and interrupt system availability.

The record

CVE
CVE-2025-39679
Published
Sep 5, 2025
Updated
Sep 5, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 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=6.6
  2. Affected versionversion=6b252cf42281045a9f803d2198023500cfa6ebd2 <72553fe19317fe93cb8591c83095c446bc7fe292
  3. Affected versionversion=6b252cf42281045a9f803d2198023500cfa6ebd2 <7d9110e3b35d08832661da1a1fc2d24455981a04
  4. Affected versionversion=6b252cf42281045a9f803d2198023500cfa6ebd2 <bb8aeaa3191b617c6faf8ae937252e059673b7ea
  5. Affected versionversion=6b252cf42281045a9f803d2198023500cfa6ebd2 <cabcb52d76d3d42f16c344a96e098dd9d18602f8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=6b252cf42281045a9f803d2198023500cfa6ebd2 <72553fe19317fe93cb8591c83095c446bc7fe292; version=6b252cf42281045a9f803d2198023500cfa6ebd2 <7d9110e3b35d08832661da1a1fc2d24455981a04; version=6b252cf42281045a9f803d2198023500cfa6ebd2 <bb8aeaa3191b617c6faf8ae937252e059673b7ea; version=6b252cf42281045a9f803d2198023500cfa6ebd2 <cabcb52d76d3d42f16c344a96e098dd9d18602f8

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 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

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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