CVE-2023-53633

Local service interruption via leaked page references

Published Oct 7, 2025 · Updated Oct 7, 2025

Memory leak in the QAIC accelerator driver in Linux kernel 6.4 allows local users to exhaust memory through partial user-page mappings. map_user_pages() returns after get_user_pages_fast() pins fewer pages than requested without releasing the pages already pinned. Access to a compatible QAIC accelerator is required, and repeated failures retain page references until memory pressure interrupts host workloads.

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

Memory leak in the QAIC accelerator driver in Linux kernel 6.4 allows local users to exhaust memory through partial user-page mappings. map_user_pages() returns after get_user_pages_fast() pins fewer pages than requested without releasing the pages already pinned. Access to a compatible QAIC accelerator is required, and repeated failures retain page references until memory pressure interrupts host workloads.

The record

CVE
CVE-2023-53633
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
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=129776ac2e38231fa9c02ce20e116c99de291666 <73274c33d961f4aa0f968f763e2c9f4210b4f4a3
  2. Affected versionversion=129776ac2e38231fa9c02ce20e116c99de291666 <cdcba752a3d48fbe6f05cf2c91ab9497c8daad0c
  3. Affected versionversion=6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=129776ac2e38231fa9c02ce20e116c99de291666 <73274c33d961f4aa0f968f763e2c9f4210b4f4a3; version=129776ac2e38231fa9c02ce20e116c99de291666 <cdcba752a3d48fbe6f05cf2c91ab9497c8daad0c; version=6.4

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

CWE-401Missing Release of Memory after Effective Lifetime

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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