CVE-2022-4543Public exploit

KASLR-base disclosure via retained syscall TLB mapping

Published Jan 11, 2023 · Updated Apr 8, 2025

Information disclosure in Linux Kernel KPTI on Intel systems allows local users to leak the KASLR base through prefetch timing. The entry_SYSCALL_64 page remains mapped at a constant offset from the kernel base, and its global TLB entry survives CR3 writes. Unprivileged local code can force that page into the TLB and time prefetches to disclose the base address; no data modification or service interruption is reported.

CVSS severity5.5
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux Kernel KPTI on Intel systems allows local users to leak the KASLR base through prefetch timing. The entry_SYSCALL_64 page remains mapped at a constant offset from the kernel base, and its global TLB entry survives CR3 writes. Unprivileged local code can force that page into the TLB and time prefetches to disclose the base address; no data modification or service interruption is reported.

The record

CVE
CVE-2022-4543
Published
Jan 11, 2023
Updated
Apr 8, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-200, CWE-203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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?

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  1. Affected versionversion=all versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=all versions

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-203Observable Discrepancy

Public exploit references

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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