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CVE-2025-22045

5.5 MEDIUM

📋 TL;DR

A flaw in the Linux kernel's x86 memory management subsystem could allow improper TLB flushing when removing page table entries. This vulnerability affects Linux systems running vulnerable kernel versions, potentially allowing local attackers to cause memory corruption or privilege escalation.

💻 Affected Systems

Products:
  • Linux kernel
Versions: Specific vulnerable versions not explicitly stated in CVE; check kernel commit history for affected releases.
Operating Systems: Linux distributions using affected kernel versions
Default Config Vulnerable: ⚠️ Yes
Notes: Vulnerability is in core kernel memory management code; all configurations using affected kernel versions are vulnerable.

📦 What is this software?

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Local privilege escalation leading to full system compromise via memory corruption or kernel panic.

🟠

Likely Case

System instability, crashes, or memory corruption affecting specific processes.

🟢

If Mitigated

Minimal impact with proper kernel hardening and isolation controls in place.

🌐 Internet-Facing: LOW - Requires local access to exploit.
🏢 Internal Only: MEDIUM - Could be exploited by malicious local users or compromised accounts.

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ✅ No
Complexity: HIGH - Requires deep understanding of kernel memory management and TLB behavior.

Exploitation would require local access and sophisticated kernel manipulation techniques.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check kernel commit 0708fd6bd8161871bfbadced2ca4319b84ab44fe and related fixes

Vendor Advisory: https://git.kernel.org/stable/c/0708fd6bd8161871bfbadced2ca4319b84ab44fe

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.

🔧 Temporary Workarounds

Kernel module restrictions

linux

Restrict loading of kernel modules to reduce attack surface

echo 1 > /proc/sys/kernel/modules_disabled

🧯 If You Can't Patch

  • Implement strict access controls to limit local user privileges
  • Use kernel hardening features like SELinux/AppArmor to restrict process capabilities

🔍 How to Verify

Check if Vulnerable:

Check kernel version and compare with patched commits: uname -r and examine kernel source for affected commits

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes commit 0708fd6bd8161871bfbadced2ca4319b84ab44fe

📡 Detection & Monitoring

Log Indicators:

  • Kernel panic logs
  • Memory corruption warnings in dmesg
  • Unexpected process crashes

Network Indicators:

  • None - local vulnerability only

SIEM Query:

Search for kernel panic events or unexpected system reboots in system logs

📊 Metadata

CVE ID: CVE-2025-22045
CVSS v3 Score: 5.5 (MEDIUM)
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score: 0.1% exploit probability (28.3th percentile)
Published: April 16, 2025
Last Updated: November 3, 2025

🔗 References

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