CVE-2026-89516Hinoki check available

Kernel crash via destroyed DSQ deferred reenqueue

Published Sep 11, 2026 · Updated Sep 11, 2026

Race condition in sched_ext in Linux kernel 7.1 allows attackers to crash the kernel through a destroyed dispatch queue. process_deferred_reenq_users reads a DSQ invalidated by destroy_dsq and reaches BUG_ON because pending deferred reenqueue work is not flushed. Triggering the path requires sched_ext to be enabled and a BPF scheduler to queue a deferred reenqueue, destroy its DSQ, and reach run_deferred().

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in sched_ext in Linux kernel 7.1 allows attackers to crash the kernel through a destroyed dispatch queue. process_deferred_reenq_users reads a DSQ invalidated by destroy_dsq and reaches BUG_ON because pending deferred reenqueue work is not flushed. Triggering the path requires sched_ext to be enabled and a BPF scheduler to queue a deferred reenqueue, destroy its DSQ, and reach run_deferred().

The record

CVE
CVE-2026-89516
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.1
  2. Affected versionversion=84b1a0ea0b7c23dec240783a592e480780efe459 <8d8dd8ae89eaa78b37fc85528e926029f5facbdf
  3. Affected versionversion=84b1a0ea0b7c23dec240783a592e480780efe459 <c480961a1e790b46ffd8c20c4b6754d65ec6572d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=84b1a0ea0b7c23dec240783a592e480780efe459 <8d8dd8ae89eaa78b37fc85528e926029f5facbdf; version=84b1a0ea0b7c23dec240783a592e480780efe459 <c480961a1e790b46ffd8c20c4b6754d65ec6572d

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo