CVE-2022-49520

Misleading kernel logs via syscall-as-syndrome confusion

Published Feb 26, 2025 · Updated Aug 15, 2026

Improper diagnostic handling in Linux kernel arm64 compat code allows local users to print misleading exception messages via invalid syscalls. compat_arm_syscall stores an attacker-chosen syscall number in thread.fault_code, and arm64_show_signal misinterprets its high bits as an ESR_ELx exception class. A 32-bit arm64 compatibility process must invoke an unknown syscall below 0x80000000; the consequence is false exception context in kernel logs.

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

What happened

Improper diagnostic handling in Linux kernel arm64 compat code allows local users to print misleading exception messages via invalid syscalls. compat_arm_syscall stores an attacker-chosen syscall number in thread.fault_code, and arm64_show_signal misinterprets its high bits as an ESR_ELx exception class. A 32-bit arm64 compatibility process must invoke an unknown syscall below 0x80000000; the consequence is false exception context in kernel logs.

The record

CVE
CVE-2022-49520
Published
Feb 26, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.17
  2. Affected versionversion=532826f3712b607256eb30f92f23d1c604d3fa34 <095e975f8150ccd7f852eb578c1cdbdd2f517c7a
  3. Affected versionversion=532826f3712b607256eb30f92f23d1c604d3fa34 <3910ae71cb963fa2b68e684489d4fc3d105afda0
  4. Affected versionversion=532826f3712b607256eb30f92f23d1c604d3fa34 <3fed9e551417b84038b15117732ea4505eee386b
  5. Affected versionversion=532826f3712b607256eb30f92f23d1c604d3fa34 <621916afe8cd4f322eb12759b64a2f938d4e551d
  6. Affected versionversion=532826f3712b607256eb30f92f23d1c604d3fa34 <ad97425d23af3c3b8d4f6a2bb666cb485087c007
  7. Affected versionversion=532826f3712b607256eb30f92f23d1c604d3fa34 <efd183d988b416fcdf6f7c298a17ced4859ca77d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=532826f3712b607256eb30f92f23d1c604d3fa34 <095e975f8150ccd7f852eb578c1cdbdd2f517c7a; version=532826f3712b607256eb30f92f23d1c604d3fa34 <3910ae71cb963fa2b68e684489d4fc3d105afda0; version=532826f3712b607256eb30f92f23d1c604d3fa34 <3fed9e551417b84038b15117732ea4505eee386b; version=532826f3712b607256eb30f92f23d1c604d3fa34 <621916afe8cd4f322eb12759b64a2f938d4e551d; version=532826f3712b607256eb30f92f23d1c604d3fa34 <ad97425d23af3c3b8d4f6a2bb666cb485087c007; version=532826f3712b607256eb30f92f23d1c604d3fa34 <efd183d988b416fcdf6f7c298a17ced4859ca77d

Published CVSS scores

5.5CanonicalCVSS: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

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

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Your stack

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