CVE-2026-31502

Kernel crash via inherited header callback type confusion

Published Apr 22, 2026 · Updated Apr 22, 2026

Type confusion in team networking in Linux Kernel allows local users to crash the kernel through crafted non-Ethernet device stacking. team_setup_by_port() copies a lower device's header_ops, causing later create or parse callbacks to receive the team net_device and interpret netdev_priv() as an incompatible private type. A local user with CAP_NET_ADMIN in a user namespace can build the topology and trigger transmission; the demonstrated consequence is a kernel oops and crash.

CVSS severity7.8
High
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

Type confusion in team networking in Linux Kernel allows local users to crash the kernel through crafted non-Ethernet device stacking. team_setup_by_port() copies a lower device's header_ops, causing later create or parse callbacks to receive the team net_device and interpret netdev_priv() as an incompatible private type. A local user with CAP_NET_ADMIN in a user namespace can build the topology and trigger transmission; the demonstrated consequence is a kernel oops and crash.

The record

CVE
CVE-2026-31502
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-843, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=1d76efe1577b4323609b1bcbfafa8b731eda071a <0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0
  2. Affected versionversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <20491d384d973a63fbdaf7a71e38d69b0659ea55
  3. Affected versionversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <425000dbf17373a4ab8be9428f5dc055ef870a56
  4. Affected versionversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <6d3161fa3eee64d46b766fb0db33ec7f300ef52d
  5. Affected versionversion=3.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0; version=1d76efe1577b4323609b1bcbfafa8b731eda071a <20491d384d973a63fbdaf7a71e38d69b0659ea55; version=1d76efe1577b4323609b1bcbfafa8b731eda071a <425000dbf17373a4ab8be9428f5dc055ef870a56; version=1d76efe1577b4323609b1bcbfafa8b731eda071a <6d3161fa3eee64d46b766fb0db33ec7f300ef52d; version=3.7

Published CVSS scores

7.8LinuxCVSS: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-843Access of Resource Using Incompatible Type ('Type Confusion')
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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