CVE-2023-53395

Kernel fault via Timer operand stack underflow

Published Sep 18, 2025 · Updated Sep 18, 2025

An array-index error in Linux kernel ACPICA allows local users to trigger an out-of-bounds access via an AML Timer instruction. The Timer opcode accepts no operands but lacks AML_NO_OPERAND_RESOLVE, causing acpi_ds_exec_end_op to resolve a nonexistent operand and index the operand array at -1. Access requires a local path that evaluates ACPI AML, and the published reproduction reports a UBSAN kernel fault through acpi_power_meter.

CVSS severity7.8
High
EPSS probability0.15%
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

An array-index error in Linux kernel ACPICA allows local users to trigger an out-of-bounds access via an AML Timer instruction. The Timer opcode accepts no operands but lacks AML_NO_OPERAND_RESOLVE, causing acpi_ds_exec_end_op to resolve a nonexistent operand and index the operand array at -1. Access requires a local path that evaluates ACPI AML, and the published reproduction reports a UBSAN kernel fault through acpi_power_meter.

The record

CVE
CVE-2023-53395
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <23c67fa615c52712bfa02a6dfadbd4656c87c066
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f2a5905303ae230b5159fcd8cdcd5b3e7ad5e2d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3a21ffdbc825e0919db9da0e27ee5ff2cc8a863e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3bf4463e40a17a23f2f261dfd7fe23129bdd04a4
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <430787056dd3c591eb553d5c3b2717efcf307d4e
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <625c12dc04a607b79f180ef3ee5a12bf2e3324c0
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b102113469487b460e9e77fe9e00d49c50fe8c86
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1f686930ee4b059c7baa3c3904b2401829f2589

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <23c67fa615c52712bfa02a6dfadbd4656c87c066; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f2a5905303ae230b5159fcd8cdcd5b3e7ad5e2d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3a21ffdbc825e0919db9da0e27ee5ff2cc8a863e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3bf4463e40a17a23f2f261dfd7fe23129bdd04a4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <430787056dd3c591eb553d5c3b2717efcf307d4e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <625c12dc04a607b79f180ef3ee5a12bf2e3324c0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b102113469487b460e9e77fe9e00d49c50fe8c86; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1f686930ee4b059c7baa3c3904b2401829f2589

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-129Improper Validation of Array Index

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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