CVE-2026-53328

Local kernel warning via cgroup identity mismatch

Published Jul 1, 2026 · Updated Jul 1, 2026

Kernel warning in affected Linux Kernel releases allows local users to disrupt availability via cgroup subtree-control changes. scx_cgroup_can_attach() records movement by cgroup identity, while CSS-identity migration can legitimately pass NULL to scx_cgroup_move_task(), which incorrectly emits WARN. Reachability requires a loaded sched_ext scheduler, subtree-control access, and a stale CSS retained by an exiting task; the published result is a kernel warning rather than data access or modification.

CVSS severity5.5
Medium
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

Kernel warning in affected Linux Kernel releases allows local users to disrupt availability via cgroup subtree-control changes. scx_cgroup_can_attach() records movement by cgroup identity, while CSS-identity migration can legitimately pass NULL to scx_cgroup_move_task(), which incorrectly emits WARN. Reachability requires a loaded sched_ext scheduler, subtree-control access, and a stale CSS retained by an exiting task; the published result is a kernel warning rather than data access or modification.

The record

CVE
CVE-2026-53328
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record 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=6.12
  2. Affected versionversion=8195136669661fdfe54e9a8923c33b31c92fc1da <02e545c4297a26dbbc41df81b831e7f605bcd306
  3. Affected versionversion=8195136669661fdfe54e9a8923c33b31c92fc1da <0ffcad63b19a1cadb475c9f405a93607fdcd0d7c
  4. Affected versionversion=8195136669661fdfe54e9a8923c33b31c92fc1da <bc75f5951fac4e49d175c4433fc08fb1ec01172f
  5. Affected versionversion=8195136669661fdfe54e9a8923c33b31c92fc1da <cdff2eb97be147d2ce52ac1327841068781f25dc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=8195136669661fdfe54e9a8923c33b31c92fc1da <02e545c4297a26dbbc41df81b831e7f605bcd306; version=8195136669661fdfe54e9a8923c33b31c92fc1da <0ffcad63b19a1cadb475c9f405a93607fdcd0d7c; version=8195136669661fdfe54e9a8923c33b31c92fc1da <bc75f5951fac4e49d175c4433fc08fb1ec01172f; version=8195136669661fdfe54e9a8923c33b31c92fc1da <cdff2eb97be147d2ce52ac1327841068781f25dc

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

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

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Your stack

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