SB20260720213 - NULL pointer dereference in Linux kernel sched

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Main Vulnerability Database SB20260720213

SB20260720213 - NULL pointer dereference in Linux kernel sched

Published: July 20, 2026

Security Bulletin ID SB20260720213
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) NULL pointer dereference (CVE-ID: CVE-2026-64012)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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 a null pointer dereference in the sch_sfb packet scheduler when dequeuing packets from child qdiscs after a peek operation. A local user can trigger network traffic processing through a crafted qdisc hierarchy to cause a denial of service.

Exploitation requires the sfb scheduler to have child qdiscs whose peek callback uses qdisc_peek_dequeued().


Remediation

Install update from vendor's website.

References