CVE-2023-53131

Service degradation via leaked SUNRPC request allocations

Published May 2, 2025 · Updated May 23, 2026

Race condition in the Linux kernel SUNRPC server shutdown path allows local users to exhaust resources by leaking svc_rqst allocations. Calling kthread_stop() before the service thread runs prevents its cleanup routine from releasing the request structure. Exploitation requires local low-privileged access to reach SUNRPC server shutdown and produces availability-only service degradation.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel SUNRPC server shutdown path allows local users to exhaust resources by leaking svc_rqst allocations. Calling kthread_stop() before the service thread runs prevents its cleanup routine from releasing the request structure. Exploitation requires local low-privileged access to reach SUNRPC server shutdown and produces availability-only service degradation.

The record

CVE
CVE-2023-53131
Published
May 2, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.12
  2. Affected versionversion=4.9.52 <4.10
  3. Affected versionversion=ed6473ddc704a2005b9900ca08e236ebb2d8540a <7a3720361068ab520aed4608bad31ea9a6cc7fe7
  4. Affected versionversion=ed6473ddc704a2005b9900ca08e236ebb2d8540a <9ca6705d9d609441d34f8b853e1e4a6369b3b171
  5. Affected versionversion=ed6473ddc704a2005b9900ca08e236ebb2d8540a <ad7e40ee157ba33950a4ccdc284334580da3638d
  6. Affected versionversion=ed6473ddc704a2005b9900ca08e236ebb2d8540a <ce7dd61e004002bc1c48d1ca47c887f3f3cc7370
  7. Affected versionversion=ed6473ddc704a2005b9900ca08e236ebb2d8540a <f74b3286859463cd63cc9d4aeaabd8b0c640182a
  8. Affected versionversion=f609266b12d214437cf9d68245dc27f8d4f69836

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=4.9.52 <4.10; version=ed6473ddc704a2005b9900ca08e236ebb2d8540a <7a3720361068ab520aed4608bad31ea9a6cc7fe7; version=ed6473ddc704a2005b9900ca08e236ebb2d8540a <9ca6705d9d609441d34f8b853e1e4a6369b3b171; version=ed6473ddc704a2005b9900ca08e236ebb2d8540a <ad7e40ee157ba33950a4ccdc284334580da3638d; version=ed6473ddc704a2005b9900ca08e236ebb2d8540a <ce7dd61e004002bc1c48d1ca47c887f3f3cc7370; version=ed6473ddc704a2005b9900ca08e236ebb2d8540a <f74b3286859463cd63cc9d4aeaabd8b0c640182a; version=f609266b12d214437cf9d68245dc27f8d4f69836

Published CVSS scores

5.5NVDCVSS: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 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

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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