CVE-2026-53128

Local denial of service via unmatched RCU unlock

Published Jun 24, 2026 · Updated Jun 24, 2026

Denial of service in the Linux Kernel allows local users to interrupt the system through a DRBD device-dump request. The common exit path in drbd_adm_dump_devices() calls rcu_read_unlock() even when early request processing bypasses the matching rcu_read_lock(), leaving RCU state unbalanced. Local low-privileged access to the DRBD generic-netlink interface is required; no data disclosure or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Denial of service in the Linux Kernel allows local users to interrupt the system through a DRBD device-dump request. The common exit path in drbd_adm_dump_devices() calls rcu_read_unlock() even when early request processing bypasses the matching rcu_read_lock(), leaving RCU state unbalanced. Local low-privileged access to the DRBD generic-netlink interface is required; no data disclosure or modification is reported.

The record

CVE
CVE-2026-53128
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=4.5
  2. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <1f112240531f0a0b437b2e001c1d89e8b25a8328
  3. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <282e06e6d494a7bee85af78c747527b7d4009cc3
  4. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <2b31e86387e60b3689339f0f0fbb4d3623d9d494
  5. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <68ebb9183ac3621b96b18e046841eadb9508783c
  6. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <6cd27bcb71bb73f955d104cc3a62be6f83724392
  7. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <8092713a10c19fa0f731b71b2853af4319ca54fd
  8. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <996d279f2c985d771d6cfdd923e447d825726e06
  9. Affected versionversion=a55bbd375d1802141f0f043e2cd08f85c23d6209 <ae12bb44b392637a8321ade305c883f9ffc0daea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.5; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <1f112240531f0a0b437b2e001c1d89e8b25a8328; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <282e06e6d494a7bee85af78c747527b7d4009cc3; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <2b31e86387e60b3689339f0f0fbb4d3623d9d494; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <68ebb9183ac3621b96b18e046841eadb9508783c; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <6cd27bcb71bb73f955d104cc3a62be6f83724392; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <8092713a10c19fa0f731b71b2853af4319ca54fd; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <996d279f2c985d771d6cfdd923e447d825726e06; version=a55bbd375d1802141f0f043e2cd08f85c23d6209 <ae12bb44b392637a8321ade305c883f9ffc0daea

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/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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