CVE-2026-53126

Service interruption via leaked disk references

Published Jun 24, 2026 · Updated Jun 24, 2026

Resource leak in the block-cgroup subsystem of Linux Kernel allows local users to interrupt service via failed throttling lookups. The error exits in blkcg_maybe_throttle_current() clear current->throttle_disk but omit put_disk() after blkcg, blkg, or blkg_tryget() lookup failure, leaving the gendisk reference permanently held. Local low-privileged access is required; each reached failure path keeps its disk pinned, creating an availability-only resource leak.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the block-cgroup subsystem of Linux Kernel allows local users to interrupt service via failed throttling lookups. The error exits in blkcg_maybe_throttle_current() clear current->throttle_disk but omit put_disk() after blkcg, blkg, or blkg_tryget() lookup failure, leaving the gendisk reference permanently held. Local low-privileged access is required; each reached failure path keeps its disk pinned, creating an availability-only resource leak.

The record

CVE
CVE-2026-53126
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=6.3
  2. Affected versionversion=f05837ed73d0c73e950b2d9f2612febb0d3d451e <000e8454692cab9d1f1b80130e2870e355301d06
  3. Affected versionversion=f05837ed73d0c73e950b2d9f2612febb0d3d451e <23308af722fefed00af5f238024c11710938fba3
  4. Affected versionversion=f05837ed73d0c73e950b2d9f2612febb0d3d451e <4048ed98860d3785645ebbd34f69566a6c7320c3
  5. Affected versionversion=f05837ed73d0c73e950b2d9f2612febb0d3d451e <73a5af059905d171b398c8b2381632ee499948b5
  6. Affected versionversion=f05837ed73d0c73e950b2d9f2612febb0d3d451e <b3e005f16cd98f815429a87aef4c61e9c140779f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.3; version=f05837ed73d0c73e950b2d9f2612febb0d3d451e <000e8454692cab9d1f1b80130e2870e355301d06; version=f05837ed73d0c73e950b2d9f2612febb0d3d451e <23308af722fefed00af5f238024c11710938fba3; version=f05837ed73d0c73e950b2d9f2612febb0d3d451e <4048ed98860d3785645ebbd34f69566a6c7320c3; version=f05837ed73d0c73e950b2d9f2612febb0d3d451e <73a5af059905d171b398c8b2381632ee499948b5; version=f05837ed73d0c73e950b2d9f2612febb0d3d451e <b3e005f16cd98f815429a87aef4c61e9c140779f

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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