CVE-2023-53687

Local denial of service via leaked clock references

Published Oct 7, 2025 · Updated Oct 7, 2025

Memory leak in the Linux kernel Samsung serial driver allows local users to interrupt service by exhausting kernel memory. When s3c24xx_serial_getclk() searches candidate clocks, it retains superseded and rejected clock references instead of releasing them with clk_put(). The path requires local low-privileged access and a system using the Samsung serial driver; repeated clock selection exhausts kernel memory and interrupts service.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel Samsung serial driver allows local users to interrupt service by exhausting kernel memory. When s3c24xx_serial_getclk() searches candidate clocks, it retains superseded and rejected clock references instead of releasing them with clk_put(). The path requires local low-privileged access and a system using the Samsung serial driver; repeated clock selection exhausts kernel memory and interrupts service.

The record

CVE
CVE-2023-53687
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=3.3
  2. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <01dd8a43a84616c830782166ba3cceb01ad95363
  3. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <1962717c4649e026a4252fe6625175affd28a593
  4. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <1f426293fef1c13742b2a685bf7e363f51f6ee03
  5. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <46574e5a0a2aee41e6ebb979cfe1dbaea8693e16
  6. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <832e231cff476102e8204a9e7bddfe5c6154a375
  7. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <933e5b2998bc3a527d15efbf1e97c9e63297aa3c
  8. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <9dd8091959bc41fee51d0827276a2b982e84adf0
  9. Affected versionversion=5f5a7a5578c5885201cf9c85856f023fe8b81765 <f0bf102ef9b05d7294bd8d506755465f6867d944

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.3; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <01dd8a43a84616c830782166ba3cceb01ad95363; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <1962717c4649e026a4252fe6625175affd28a593; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <1f426293fef1c13742b2a685bf7e363f51f6ee03; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <46574e5a0a2aee41e6ebb979cfe1dbaea8693e16; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <832e231cff476102e8204a9e7bddfe5c6154a375; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <933e5b2998bc3a527d15efbf1e97c9e63297aa3c; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <9dd8091959bc41fee51d0827276a2b982e84adf0; version=5f5a7a5578c5885201cf9c85856f023fe8b81765 <f0bf102ef9b05d7294bd8d506755465f6867d944

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

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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

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

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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