CVE-2022-49964

Kernel warning via cache-level signedness conversion

Published Jun 18, 2025 · Updated May 11, 2026

Incorrect integer conversion in Linux 5.19.4 through 5.19.6 allows attackers to cause a kernel warning via unspecified vectors. In arch/arm64/kernel/cacheinfo.c, init_cache_level assigns a negative -ENOENT result from acpi_find_last_cache_level to unsigned fw_level, inflating the cache-leaf count. The condition occurs during boot on arm64 systems without an ACPI PPTT table, where the oversized page-allocation order produces a kernel allocation warning.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect integer conversion in Linux 5.19.4 through 5.19.6 allows attackers to cause a kernel warning via unspecified vectors. In arch/arm64/kernel/cacheinfo.c, init_cache_level assigns a negative -ENOENT result from acpi_find_last_cache_level to unsigned fw_level, inflating the cache-leaf count. The condition occurs during boot on arm64 systems without an ACPI PPTT table, where the oversized page-allocation order produces a kernel allocation warning.

The record

CVE
CVE-2022-49964
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0c80f9e165f8f9cca743d7b6cbdb54362da297e0 <e75d18cecbb3805895d8ed64da4f78575ec96043
  2. Affected versionversion=5.19.4 <5.19.7
  3. Affected versionversion=f03d253ba71994b196f342a7acad448a56812a8c <a754ee1c66bd0a23e613f0bf865053b29cb90e16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c80f9e165f8f9cca743d7b6cbdb54362da297e0 <e75d18cecbb3805895d8ed64da4f78575ec96043; version=5.19.4 <5.19.7; version=f03d253ba71994b196f342a7acad448a56812a8c <a754ee1c66bd0a23e613f0bf865053b29cb90e16

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo