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Response snapshot Nov 3, 2026, 22:26 UTC

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VulnerabilityCVE-2026-99269

Linux kernel: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs A task can be found on a non-local DSQ while the CPU which dispatched it is still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING.

At a glance

Exploited
Not known
Severity
7.8 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-99269 (opens a new tab)

What happened

In the Linux kernel, the following vulnerability has been resolved:

sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs

A task can be found on a non-local DSQ while the CPU which dispatched it is still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING. The DSQ consume and move paths don't wait for the dispatch to finish and can operate on the task concurrently with the dispatcher.

Call scx_wait_dispatching() in scx_move_local_task_to_local_dsq(), unlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() before they operate on the task. In scx_move_local_task_to_local_dsq(), wait before scx_resolve_local_dsq() as it may update p->scx.flags.

Scores and how they were measured

CVSS base severity

7.8

Version 3.1As of

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-99269 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 3). Linux kernel: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs (CVE-2026-99269). https://kevwire.com/record/CVE-2026-99269

MLA

"Linux kernel: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs (CVE-2026-99269)." KEVWire, 3 Nov. 2026, kevwire.com/record/CVE-2026-99269.

Chicago

KEVWire. "Linux kernel: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs (CVE-2026-99269)." Last modified November 3, 2026. https://kevwire.com/record/CVE-2026-99269.

Evidence summary (plain text)

Linux kernel: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs (Nov 3, 2026).
In the Linux kernel, the following vulnerability has been resolved:

sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs

A task can be found on a non-local DSQ while the CPU which dispatched it
is still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING.
The DSQ consume and move paths don't wait for the dispatch to finish and
can operate on the task concurrently with the dispatcher.

Call scx_wait_dispatching() in scx_move_local_task_to_local_dsq(),
unlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() before they
operate on the task.
CVSS 7.8 (version 3.1; evidence as of Nov 3, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-99269).
Sources:
NVD CVE-2026-99269: https://nvd.nist.gov/vuln/detail/CVE-2026-99269
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T19:55:58.742Z&lastModEndDate=2026-11-03T21:25:56.006Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T19:16:00.613Z&lastModEndDate=2026-11-03T20:55:57.138Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-99269.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 3, 2026, 21:25 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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