CVE-2023-53345
📋 TL;DR
This CVE describes a data race condition in the Linux kernel's rxrpc subsystem where concurrent access to call->error without proper synchronization could lead to inconsistent state. It affects systems running vulnerable Linux kernel versions with the rxrpc module loaded. The vulnerability could potentially cause kernel instability or crashes.
💻 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 →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
Kernel panic or system crash leading to denial of service
Likely Case
Application instability or crashes in services using rxrpc
If Mitigated
Minor performance impact or no noticeable effect
🎯 Exploit Status
Requires race condition timing and rxrpc usage. More likely to cause instability than arbitrary code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 2b5fdc0f5caa, 3e8ba61a3fe4, or 454e48a9ff04
Vendor Advisory: https://git.kernel.org/stable/c/2b5fdc0f5caa505afe34d608e2eefadadf2ee67a
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Reboot system to load new kernel. 3. Verify rxrpc module loads correctly if needed.
🔧 Temporary Workarounds
Disable rxrpc module
LinuxUnload rxrpc kernel module if not required
sudo rmmod rxrpc
echo 'blacklist rxrpc' | sudo tee /etc/modprobe.d/blacklist-rxrpc.conf
🧯 If You Can't Patch
- Monitor system logs for kernel panics or rxrpc-related crashes
- Consider disabling rxrpc functionality if not essential for operations
🔍 How to Verify
Check if Vulnerable:
Check if rxrpc module is loaded: lsmod | grep rxrpc AND check kernel version against affected rangeCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits and test rxrpc functionality📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- rxrpc-related crash reports in dmesg or syslog
- KCSAN data race warnings
Network Indicators:
- Unexpected rxrpc service disruptions
SIEM Query:
source="kernel" AND ("panic" OR "oops" OR "KCSAN" OR "rxrpc")