CVE-2026-99066Public exploit

Machine panic via uninitialized CAN packet headers

Published Oct 23, 2026 · Updated Oct 23, 2026

Denial of service in Linux 7.0 allows local users to crash the machine by delivering CAN traffic to a SOCK_PACKET socket. The init_can_skb() function leaves header offsets uninitialized, causing packet_rcv_spkt() to calculate an overflowing push length from mac_header = 0xFFFF and trigger a kernel panic. The panic requires CAN receive traffic reaching a legacy SOCK_PACKET socket; creating that socket requires CAP_NET_RAW in the governing user namespace.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux 7.0 allows local users to crash the machine by delivering CAN traffic to a SOCK_PACKET socket. The init_can_skb() function leaves header offsets uninitialized, causing packet_rcv_spkt() to calculate an overflowing push length from mac_header = 0xFFFF and trigger a kernel panic. The panic requires CAN receive traffic reaching a legacy SOCK_PACKET socket; creating that socket requires CAP_NET_RAW in the governing user namespace.

The record

CVE
CVE-2026-99066
Published
Oct 23, 2026
Updated
Oct 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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=7.0
  2. Affected versionversion=9f10374bb024593a611e6845847f0444841a231b <0a04c0cb8606ff88399489d03ef255afe90d0d5f
  3. Affected versionversion=9f10374bb024593a611e6845847f0444841a231b <8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=7.0; version=9f10374bb024593a611e6845847f0444841a231b <0a04c0cb8606ff88399489d03ef255afe90d0d5f; version=9f10374bb024593a611e6845847f0444841a231b <8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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