SB20261023126 - Improper input validation in Linux kernel packet

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Main Vulnerability Database SB20261023126

SB20261023126 - Improper input validation in Linux kernel packet

Published: October 23, 2026

Security Bulletin ID SB20261023126
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-99033)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by triggering a kernel panic.

The vulnerability exists due to improper validation of link-layer header state in packet_rcv_spkt() when receiving packets from a device without a visible link-layer header. A local privileged user can bind a SOCK_PACKET socket to a CAN interface and cause it to receive a frame with an uninitialized MAC header offset, triggering an invalid skb_push() operation to cause a system-wide denial of service.

The panic occurs in softirq context and terminates the system even with panic_on_oops=0.


Remediation

Install update from vendor's website.

References