CVE-2023-53527
📋 TL;DR
A memory leak vulnerability in the Linux kernel's Thunderbolt driver allows attackers to cause denial of service through resource exhaustion. This affects systems with Thunderbolt hardware running vulnerable kernel versions. The vulnerability requires local access to exploit.
💻 Affected Systems
- Linux kernel
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
System crash or instability due to kernel memory exhaustion, potentially leading to denial of service.
Likely Case
Gradual performance degradation and potential system instability over time with repeated exploitation.
If Mitigated
Minimal impact if proper access controls prevent unauthorized local users from triggering the vulnerability.
🎯 Exploit Status
Requires local access and ability to trigger Thunderbolt DP bandwidth requests. No known public exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in stable kernel commits: 0752bb32aed2c5dd85821195a507a1079c4835f7 and 596a5123cc782d458b057eb3837e66535cd0befa
Vendor Advisory: https://git.kernel.org/stable/c/0752bb32aed2c5dd85821195a507a1079c4835f7
Restart Required: Yes
Instructions:
1. Update to latest stable kernel version containing the fix. 2. For distributions: Use package manager to update kernel package. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable Thunderbolt
linuxDisable Thunderbolt support if not needed
echo 'blacklist thunderbolt' >> /etc/modprobe.d/blacklist.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Restrict local user access to prevent unauthorized users from exploiting the vulnerability
- Monitor system memory usage and kernel logs for signs of memory exhaustion
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if Thunderbolt module is loaded: lsmod | grep thunderboltCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check dmesg for Thunderbolt-related errors📡 Detection & Monitoring
Log Indicators:
- Kernel OOM (Out of Memory) messages in dmesg
- Increasing memory usage without clear cause
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("out of memory" OR "OOM" OR "thunderbolt")