CVE-2024-56368
📋 TL;DR
A Linux kernel integer overflow vulnerability in the ring buffer subsystem allows local attackers to trigger a slab-out-of-bounds memory access during mmap operations. This affects systems using the kernel's tracing functionality and can lead to kernel memory corruption or crashes. Only local users with access to tracing interfaces are affected.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash, or potential privilege escalation if combined with other vulnerabilities to achieve arbitrary code execution in kernel context.
Likely Case
Denial of service through kernel crash or system instability when malicious users trigger the overflow via tracing interfaces.
If Mitigated
Limited impact if tracing functionality is disabled or access is restricted to privileged users only.
🎯 Exploit Status
Reproducer code provided in CVE description demonstrates triggering the vulnerability. Exploitation requires local user access to tracing interfaces.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits c58a812c8e49ad688f94f4b050ad5c5b388fc5d2 and ec12f30fe54234dd40ffee50dda8d2df10bd0871
Vendor Advisory: https://git.kernel.org/stable/c/c58a812c8e49ad688f94f4b050ad5c5b388fc5d2
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable tracing functionality
linuxPrevent access to vulnerable ring buffer mmap operations by disabling kernel tracing
echo 0 > /sys/kernel/tracing/tracing_on
chmod 000 /sys/kernel/tracing/per_cpu/cpu*/trace_pipe_raw
Restrict tracing access
linuxLimit access to tracing interfaces to privileged users only
chmod 600 /sys/kernel/tracing/per_cpu/cpu*/trace_pipe_raw
chown root:root /sys/kernel/tracing/per_cpu/cpu*/trace_pipe_raw
🧯 If You Can't Patch
- Restrict access to /sys/kernel/tracing interfaces using filesystem permissions
- Disable unprivileged user access to debugfs where tracing interfaces are mounted
🔍 How to Verify
Check if Vulnerable:
Check if system crashes when running the reproducer code from CVE description with appropriate tracing permissionsCheck Version:
uname -rVerify Fix Applied:
Check kernel version contains fix commits: 'uname -r' and verify with distribution patch notes📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- KASAN reports of slab-out-of-bounds in __rb_map_vma
- System crashes following access to tracing interfaces
Network Indicators:
- None - local vulnerability only
SIEM Query:
search 'KASAN: slab-out-of-bounds' OR 'ring_buffer.c:7058' OR 'tracing_buffers_mmap' in kernel logs