SB20260827138 - Improper access control in Linux kernel sched

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Main Vulnerability Database SB20260827138

SB20260827138 - Improper access control in Linux kernel sched

Published: August 27, 2026

Security Bulletin ID SB20260827138
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-74736)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper access control in cls_bpf_prog_from_efd() in net/sched/cls_bpf.c when attaching a device-bound bpf classifier program to a network device via cls_bpf with skip_sw. A local user can attach a program bound to a different device and then delete the original device to cause a denial of service.

The issue can trigger a kernel warning and may panic the system when panic_on_warn=1.


Remediation

Install update from vendor's website.

References