CVE-2026-63990

Kernel crash via invalid CAN device bonding

Published Jul 19, 2026 · Updated Jul 19, 2026

NULL-pointer dereference in Linux Kernel bonding allows local users to crash the kernel by enslaving a virtual CAN interface. The bond_enslave() path accepts ARPHRD_CAN devices and applies Ethernet-oriented state changes without maintaining can_ml_priv, causing can_rx_unregister() to dereference a null receiver-list pointer during later socket cleanup. Reachability requires local control over network-device configuration and a virtual CAN interface; successful triggering interrupts the host.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
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 bonding allows local users to crash the kernel by enslaving a virtual CAN interface. The bond_enslave() path accepts ARPHRD_CAN devices and applies Ethernet-oriented state changes without maintaining can_ml_priv, causing can_rx_unregister() to dereference a null receiver-list pointer during later socket cleanup. Reachability requires local control over network-device configuration and a virtual CAN interface; successful triggering interrupts the host.

The record

CVE
CVE-2026-63990
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=2.6.25
  2. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <02f1c87ded33b43d48b4a1d665da15f2157b30d8
  3. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <41e8478c4cd896d3abbe33d41afc90c84ac66602
  4. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <563090e5d450c665f70d955a39f9587afc7842eb
  5. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <69b78b5f3033272e53a2dc2dad675962654a5b38
  6. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <8ba68464e4787b6a7ec938826e16124df20fd23d
  7. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <9ea8a648d9120f7652bcde1ce2c4ad66871af707
  8. Affected versionversion=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <f4d78a81f57df82e9d82a2c07471fed1a1235893

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.25; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <02f1c87ded33b43d48b4a1d665da15f2157b30d8; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <41e8478c4cd896d3abbe33d41afc90c84ac66602; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <563090e5d450c665f70d955a39f9587afc7842eb; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <69b78b5f3033272e53a2dc2dad675962654a5b38; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <8ba68464e4787b6a7ec938826e16124df20fd23d; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <9ea8a648d9120f7652bcde1ce2c4ad66871af707; version=cd05acfe65ed2cf2db683fa9a6adb8d35635263b <f4d78a81f57df82e9d82a2c07471fed1a1235893

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

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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