CVE-2025-38019

Kernel memory corruption via stale GRE neighbor replay

Published Jun 18, 2025 · Updated May 11, 2026

Use-after-free in the Linux kernel mlxsw driver allows local users to corrupt kernel memory by deleting a replayed GRE neighbor. During driver reload, neighbor replay omits the normal upper-device check and offloads a GRE neighbor, while later deletion ignores its notification and leaves a freed object referenced. Reaching the flaw requires privileges to administer network devices and reload the mlxsw driver on Spectrum hardware; dereferencing the stale object can crash the kernel or corrupt memory.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel mlxsw driver allows local users to corrupt kernel memory by deleting a replayed GRE neighbor. During driver reload, neighbor replay omits the normal upper-device check and offloads a GRE neighbor, while later deletion ignores its notification and leaves a freed object referenced. Reaching the flaw requires privileges to administer network devices and reload the mlxsw driver on Spectrum hardware; dereferencing the stale object can crash the kernel or corrupt memory.

The record

CVE
CVE-2025-38019
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.6
  2. Affected versionversion=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <92ec4855034b2c4d13f117558dc73d20581fa9ff
  3. Affected versionversion=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <9ab7945f3a61ed23da412e30f1e56414c05c4f06
  4. Affected versionversion=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <abc43c1ffdbc801b0b04ac845bfaf1d42b8f68f7
  5. Affected versionversion=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <f1ecccb5cdda39bca8cd17bb0b6cf61361e33578

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <92ec4855034b2c4d13f117558dc73d20581fa9ff; version=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <9ab7945f3a61ed23da412e30f1e56414c05c4f06; version=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <abc43c1ffdbc801b0b04ac845bfaf1d42b8f68f7; version=8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0 <f1ecccb5cdda39bca8cd17bb0b6cf61361e33578

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
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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