CVE-2024-39296
📋 TL;DR
A race condition vulnerability in the Linux kernel's bonding driver causes a kernel oops (crash) during module removal or initialization errors. This affects systems using Linux kernel bonding functionality, potentially leading to denial of service. The vulnerability requires local access to trigger.
💻 Affected Systems
- Linux kernel bonding 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, requiring physical or remote console access to reboot.
Likely Case
Kernel oops during bonding module removal or initialization, causing temporary service disruption until system recovery.
If Mitigated
Minor disruption during maintenance operations if proper patching is applied.
🎯 Exploit Status
Exploitation requires local access and ability to run rmmod or modify bonding configuration. The race condition makes timing somewhat unpredictable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel stable releases containing fixes: a45835a0bb6ef7d5ddbc0714dd760de979cb6ece, cf48aee81103ca06d09d73d33fb72f1191069aa6, f07224c16678a8af54ddc059b3d2d51885d7f35e
Vendor Advisory: https://git.kernel.org/stable/c/a45835a0bb6ef7d5ddbc0714dd760de979cb6ece
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify bonding module loads without errors.
🔧 Temporary Workarounds
Avoid bonding module removal
linuxDo not remove bonding module while bonding interfaces are configured or during system operations
# Avoid running: rmmod bonding
# Avoid: echo -bond0 > /sys/class/net/bonding_masters during module removal
🧯 If You Can't Patch
- Restrict local access to prevent unauthorized users from removing bonding module
- Avoid using bonding functionality if not required for system operation
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if bonding module is loaded: uname -r && lsmod | grep bondingCheck Version:
uname -rVerify Fix Applied:
Check kernel version against patched releases and test bonding module removal: modprobe -r bonding (should not cause oops)📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages in /var/log/kern.log or dmesg output
- Bonding module removal errors
- System crash reports
Network Indicators:
- Sudden loss of bonded network interfaces
SIEM Query:
source="kernel" AND ("oops" OR "bonding" OR "rmmod")🔗 References
- https://git.kernel.org/stable/c/a45835a0bb6ef7d5ddbc0714dd760de979cb6ece
- https://git.kernel.org/stable/c/cf48aee81103ca06d09d73d33fb72f1191069aa6
- https://git.kernel.org/stable/c/f07224c16678a8af54ddc059b3d2d51885d7f35e
- https://git.kernel.org/stable/c/a45835a0bb6ef7d5ddbc0714dd760de979cb6ece
- https://git.kernel.org/stable/c/cf48aee81103ca06d09d73d33fb72f1191069aa6
- https://git.kernel.org/stable/c/f07224c16678a8af54ddc059b3d2d51885d7f35e
