CVE-2023-53215

Kernel warning via current-CPU scheduler rebalance

Published Sep 15, 2025 · Updated Sep 15, 2025

Improper task balancing in Linux 3.6 through 6.4 allows local users to trigger a kernel warning during scheduler load balancing. load_balance selects a migration-disabled task's current CPU from env->dst_grpmask when the requested destination is disallowed, then passes that unchanged placement to set_task_cpu. The condition requires overlapping scheduler groups and a migration-disabled task that is not running; the warning is superfluous, and no additional consequence is demonstrated.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper task balancing in Linux 3.6 through 6.4 allows local users to trigger a kernel warning during scheduler load balancing. load_balance selects a migration-disabled task's current CPU from env->dst_grpmask when the requested destination is disallowed, then passes that unchanged placement to set_task_cpu. The condition requires overlapping scheduler groups and a migration-disabled task that is not running; the warning is superfluous, and no additional consequence is demonstrated.

The record

CVE
CVE-2023-53215
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0dd37d6dd33a9c23351e6115ae8cdac7863bc7de
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <32d937f94b7805d4c9028b8727a7d6241547da54
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34eb902050d473bb2befa15714fb1d30a0991c15
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3cb43222bab8ab328fc91ed30899b3df2efbccfd
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b0c79aa33075b34c3cdcea4132c0afb3fc42d68
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <78a5f711efceb37e32c48cd6b40addb671fea9cc
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a5286f4655ce2fa28f477c0b957ea7f323fe2fab
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cec1857b1ea5cc3ea2b600564f1c95d1a6f27ad1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0dd37d6dd33a9c23351e6115ae8cdac7863bc7de; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <32d937f94b7805d4c9028b8727a7d6241547da54; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34eb902050d473bb2befa15714fb1d30a0991c15; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3cb43222bab8ab328fc91ed30899b3df2efbccfd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b0c79aa33075b34c3cdcea4132c0afb3fc42d68; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <78a5f711efceb37e32c48cd6b40addb671fea9cc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a5286f4655ce2fa28f477c0b957ea7f323fe2fab; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cec1857b1ea5cc3ea2b600564f1c95d1a6f27ad1

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

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Your stack

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