CVE-2022-4543

MEDIUM

Linux Kernel - KASLR Base Leak via EntryBleed TLB Prefetch Side-Channel

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2022-4543. PoCs published by sunichi, ngtuonghung.

AI-analyzed exploit summary This repository contains a wrapper for CVE-2022-4543, a Linux kernel vulnerability, which helps in de-KASLR (Kernel Address Space Layout Randomization) by identifying the kernel base address through a side-channel attack. It includes a C program (`dekaslr.c`) to perform the side-channel attack and a C++ program (`main.cpp`) to automate the process and determine the most frequent kernel base address.

Description

A flaw named "EntryBleed" was found in the Linux Kernel Page Table Isolation (KPTI). This issue could allow a local attacker to leak KASLR base via prefetch side-channels based on TLB timing for Intel systems.

Exploits (2)

nomisec WORKING POC 3 stars
by sunichi · poc
https://github.com/sunichi/cve-2022-4543-wrapper

This repository contains a wrapper for CVE-2022-4543, a Linux kernel vulnerability, which helps in de-KASLR (Kernel Address Space Layout Randomization) by identifying the kernel base address through a side-channel attack. It includes a C program (`dekaslr.c`) to perform the side-channel attack and a C++ program (`main.cpp`) to automate the process and determine the most frequent kernel base address.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Linux Kernel (specific versions affected by CVE-2022-4543)
No auth needed
Prerequisites: Access to a vulnerable Linux kernel · Ability to execute binaries on the target system
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by ngtuonghung · poc
https://github.com/ngtuonghung/CVE-2022-4543-EntryBleed

This repository contains a functional exploit PoC for CVE-2022-4543 (EntryBleed), a side-channel attack targeting the Linux kernel's syscall entry mechanism. The exploit includes kernel and BusyBox build scripts, along with C code to leak kernel entry addresses via timing side channels.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Complex
Reliability
Racy
Target: Linux kernel (specific versions affected by EntryBleed)
No auth needed
Prerequisites: Linux kernel with vulnerable syscall entry mechanism · Local execution environment · Docker for building kernel/BusyBox
devstral-2 · analyzed Apr 29, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit, Mailing List, Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/12/16/3
Exploit, Third Party Advisory
https://www.willsroot.io/2022/12/entrybleed.html

Scores

CVSS v3 5.5
EPSS 0.0095
EPSS Percentile 56.7%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-200 CWE-203
Status published
Products (1)
linux/linux_kernel
Published Jan 11, 2023
Tracked Since Feb 18, 2026