CVE-2023-53474

Local service interruption via MCA bank mask overflow

Published Oct 1, 2025 · Updated Oct 1, 2025

Integer overflow in the Linux kernel's AMD machine-check setup allows local users to interrupt service when MCA bank initialization reaches bank 32. The amd.c initialization code stores a mask for as many as 64 banks in a 32-bit unsigned int and shifts a 32-bit BIT value by the bank number, producing an out-of-bounds shift at 32 or above. Exploitation requires local low-privileged access on an x86 AMD system exposing at least 33 MCA banks, and the documented impact is limited to availability.

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

What happened

Integer overflow in the Linux kernel's AMD machine-check setup allows local users to interrupt service when MCA bank initialization reaches bank 32. The amd.c initialization code stores a mask for as many as 64 banks in a 32-bit unsigned int and shifts a 32-bit BIT value by the bank number, producing an out-of-bounds shift at 32 or above. Exploitation requires local low-privileged access on an x86 AMD system exposing at least 33 MCA banks, and the documented impact is limited to availability.

The record

CVE
CVE-2023-53474
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=5.10
  2. Affected versionversion=a0bc32b3cacf194dc479b342f006203fd1e1941a <11c58a0c1937c157dbdf82d5ab634d68c99f3098
  3. Affected versionversion=a0bc32b3cacf194dc479b342f006203fd1e1941a <4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156
  4. Affected versionversion=a0bc32b3cacf194dc479b342f006203fd1e1941a <67bb7521b6420d81dab7538c0686f18f7d6d09f4
  5. Affected versionversion=a0bc32b3cacf194dc479b342f006203fd1e1941a <9669fa17287c3af2bbd4868d4c8fdd9e57f8332e
  6. Affected versionversion=a0bc32b3cacf194dc479b342f006203fd1e1941a <a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83
  7. Affected versionversion=a0bc32b3cacf194dc479b342f006203fd1e1941a <ba8ffb1251eb629c2ec35220e3896cf4f7b888a7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=a0bc32b3cacf194dc479b342f006203fd1e1941a <11c58a0c1937c157dbdf82d5ab634d68c99f3098; version=a0bc32b3cacf194dc479b342f006203fd1e1941a <4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156; version=a0bc32b3cacf194dc479b342f006203fd1e1941a <67bb7521b6420d81dab7538c0686f18f7d6d09f4; version=a0bc32b3cacf194dc479b342f006203fd1e1941a <9669fa17287c3af2bbd4868d4c8fdd9e57f8332e; version=a0bc32b3cacf194dc479b342f006203fd1e1941a <a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83; version=a0bc32b3cacf194dc479b342f006203fd1e1941a <ba8ffb1251eb629c2ec35220e3896cf4f7b888a7

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-190Integer Overflow or Wraparound
T1499.004Application 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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