CVE-2023-52629
📋 TL;DR
A use-after-free vulnerability in the Linux kernel's SH architecture push-switch driver allows local attackers to potentially execute arbitrary code or cause denial of service. This affects systems running vulnerable Linux kernel versions with SH architecture support. Attackers need local access to exploit this vulnerability.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially leading to complete system compromise.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
No impact if patched or if SH architecture support is not enabled.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel memory layout. Race condition makes exploitation timing-sensitive.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits 246f80a0b17f and 610dbd8ac271)
Vendor Advisory: https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
Restart Required: Yes
Instructions:
1. Update to a patched Linux kernel version from your distribution vendor. 2. Rebuild kernel if compiling from source with the fix commits. 3. Reboot system to load patched kernel.
🔧 Temporary Workarounds
Disable SH architecture support
linuxRemove SH architecture support from kernel configuration if not needed
# Reconfigure kernel without SH architecture support
# Rebuild and install kernel
🧯 If You Can't Patch
- Restrict local user access to prevent potential exploitation
- Implement strict privilege separation and limit users who can load kernel modules
🔍 How to Verify
Check if Vulnerable:
Check kernel version and configuration for SH architecture support: grep CONFIG_SH /boot/config-$(uname -r)Check Version:
uname -rVerify Fix Applied:
Verify kernel version is patched and check for presence of fix commits in kernel source📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes or panics
- Unexpected kernel module activity
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for kernel panic logs or suspicious local privilege escalation attempts