CVE-2022-49885

Local service interruption via ACPI source-count overflow

Published May 1, 2025 · Updated May 11, 2026

Integer overflow in affected Linux kernel releases allows local users to cause a vmalloc failure during ACPI initialization. The ghes_estatus_pool_init() function multiplies the signed num_ghes count by GHES_ESOURCE_PREALLOC_MAX_SIZE, so the length calculation wraps before vmalloc() receives it. Triggering the failure requires local access and an ACPI HEST configuration with enough GHES error sources; the observed consequence is a boot-time allocation failure and service interruption.

CVSS severity5.5
Medium
EPSS probability0.22%
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 affected Linux kernel releases allows local users to cause a vmalloc failure during ACPI initialization. The ghes_estatus_pool_init() function multiplies the signed num_ghes count by GHES_ESOURCE_PREALLOC_MAX_SIZE, so the length calculation wraps before vmalloc() receives it. Triggering the failure requires local access and an ACPI HEST configuration with enough GHES error sources; the observed consequence is a boot-time allocation failure and service interruption.

The record

CVE
CVE-2022-49885
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=5.1
  2. Affected versionversion=fb7be08f1a091ec243780bfdad4bf0c492057808 <43d2748394c3feb86c0c771466f5847e274fc043
  3. Affected versionversion=fb7be08f1a091ec243780bfdad4bf0c492057808 <4c10c854113720cbfe75d4f51db79b700a629e73
  4. Affected versionversion=fb7be08f1a091ec243780bfdad4bf0c492057808 <9edf20e5a1d805855e78f241cf221d741b50d482
  5. Affected versionversion=fb7be08f1a091ec243780bfdad4bf0c492057808 <c50ec15725e005e9fb20bce69b6c23b135a4a9b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=fb7be08f1a091ec243780bfdad4bf0c492057808 <43d2748394c3feb86c0c771466f5847e274fc043; version=fb7be08f1a091ec243780bfdad4bf0c492057808 <4c10c854113720cbfe75d4f51db79b700a629e73; version=fb7be08f1a091ec243780bfdad4bf0c492057808 <9edf20e5a1d805855e78f241cf221d741b50d482; version=fb7be08f1a091ec243780bfdad4bf0c492057808 <c50ec15725e005e9fb20bce69b6c23b135a4a9b7

Published CVSS scores

5.5CISA-ADPCVSS: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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