SB20260816495 - Operation on a Resource after Expiration or Release in Linux kernel sched

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Main Vulnerability Database SB20260816495

SB20260816495 - Operation on a Resource after Expiration or Release in Linux kernel sched

Published: August 16, 2026

Security Bulletin ID SB20260816495
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) Operation on a Resource after Expiration or Release (CVE-ID: CVE-2026-72036)

CWE-ID: CWE-672 - Operation on a Resource after Expiration or Release

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 improper state management in multiq_dequeue in the sch_multiq scheduler when handling queued packets after a peek operation on a non-work-conserving child qdisc. A local user can trigger network traffic through the affected queuing path to cause a denial of service.

The issue can desynchronize the child queue length and backlog accounting and lead to a NULL pointer dereference in softirq context on egress.


Remediation

Install update from vendor's website.

References