CVE-2025-39858

System crash via mishandled page-pool error pointer

Published Sep 19, 2025 · Updated Sep 19, 2025

NULL pointer dereference in Linux kernel 6.15 allows local users to crash the host during mlx4 receive-ring creation. mlx4_en_create_rx_ring tests page_pool_create() with a NULL check even though failures are encoded as ERR_PTR values, then passes the invalid pointer onward. Triggering the failure requires control of a physical mlx4 Mellanox NIC and uid 0 or equivalent privileges in the initial network namespace.

CVSS severity5.5
Medium
EPSS probability0.13%
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 Linux kernel 6.15 allows local users to crash the host during mlx4 receive-ring creation. mlx4_en_create_rx_ring tests page_pool_create() with a NULL check even though failures are encoded as ERR_PTR values, then passes the invalid pointer onward. Triggering the failure requires control of a physical mlx4 Mellanox NIC and uid 0 or equivalent privileges in the initial network namespace.

The record

CVE
CVE-2025-39858
Published
Sep 19, 2025
Updated
Sep 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=6.15
  2. Affected versionversion=8533b14b3d65ee666ba31254787c1bdaee56d95a <7b77d8841a98a9f45c8a615222c698df8dec581c
  3. Affected versionversion=8533b14b3d65ee666ba31254787c1bdaee56d95a <e580beaf43d563aaf457f1c7f934002355ebfe7b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=8533b14b3d65ee666ba31254787c1bdaee56d95a <7b77d8841a98a9f45c8a615222c698df8dec581c; version=8533b14b3d65ee666ba31254787c1bdaee56d95a <e580beaf43d563aaf457f1c7f934002355ebfe7b

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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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