CVE-2026-64190

Kernel crash via NULL transmit handler race

Published Jul 20, 2026 · Updated Jul 20, 2026

Race condition in the Linux Kernel team driver allows local users to crash the kernel during a concurrent network mode change. The __team_change_mode() path clears team->ops before restoring dummy handlers, allowing concurrent team_xmit() to call a NULL transmit pointer. Triggering the crash requires CAP_NET_ADMIN, a team-device mode change, and simultaneous AF_PACKET transmission with forced carrier.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux Kernel team driver allows local users to crash the kernel during a concurrent network mode change. The __team_change_mode() path clears team->ops before restoring dummy handlers, allowing concurrent team_xmit() to call a NULL transmit pointer. Triggering the crash requires CAP_NET_ADMIN, a team-device mode change, and simultaneous AF_PACKET transmission with forced carrier.

The record

CVE
CVE-2026-64190
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=3.3
  2. Affected versionversion=3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 <03e9405c518c4d61f28079492f252d6d4e2bac5c
  3. Affected versionversion=3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 <25fe708bbc59289d3d1ea4b126fbc1b460a072a5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.3; version=3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 <03e9405c518c4d61f28079492f252d6d4e2bac5c; version=3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 <25fe708bbc59289d3d1ea4b126fbc1b460a072a5

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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