CVE-2023-53638
📋 TL;DR
A use-after-free vulnerability in the Linux kernel's octeon_ep driver allows local attackers to potentially crash the system or execute arbitrary code. This affects systems using Cavium OCTEON network interface cards with vulnerable kernel versions. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Linux kernel with octeon_ep driver
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to kernel compromise, system crash, or arbitrary code execution with kernel privileges.
Likely Case
Kernel panic or system crash causing denial of service on affected systems.
If Mitigated
Limited impact due to requirement for local access and specific hardware configuration.
🎯 Exploit Status
Exploitation requires local access and specific hardware configuration. The vulnerability is triggered during driver initialization failure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 62312e2f6466b5f0a120542a38b410d88a34ed00 and 758c91078165ae641b698750a72eafe7968b3756
Vendor Advisory: https://git.kernel.org/stable/c/62312e2f6466b5f0a120542a38b410d88a34ed00
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check with your distribution for specific patched kernel versions. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable octeon_ep driver
linuxPrevent loading of the vulnerable driver if not needed
echo 'blacklist octeon_ep' >> /etc/modprobe.d/blacklist.conf
rmmod octeon_ep
Restrict local access
allLimit local user access to systems with vulnerable hardware
🧯 If You Can't Patch
- Ensure systems with OCTEON hardware have restricted local user access
- Monitor for kernel crashes or unusual system behavior related to network driver initialization
🔍 How to Verify
Check if Vulnerable:
Check if octeon_ep driver is loaded: lsmod | grep octeon_ep. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or is newer than vulnerable versions. Check with distribution security advisories.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- Use-after-free warnings in kernel logs
- octeon_ep driver initialization failures
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("octeon_ep" OR "use-after-free" OR "kernel panic")