CVE-2024-39467
📋 TL;DR
A memory corruption vulnerability in the Linux kernel's F2FS filesystem allows attackers to trigger out-of-bounds reads via specially crafted filesystems. This affects Linux systems using F2FS filesystem and can lead to kernel crashes or potential privilege escalation. The vulnerability requires local access to mount a malicious F2FS filesystem.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to denial of service, or potential privilege escalation if combined with other vulnerabilities.
Likely Case
Kernel crash causing system instability or denial of service.
If Mitigated
No impact if F2FS is not used or proper access controls prevent mounting untrusted filesystems.
🎯 Exploit Status
Exploitation requires ability to mount a malicious F2FS filesystem, which typically requires local access and appropriate permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits: 1640dcf383cdba52be8b28d2a1a2aa7ef7a30c98, 20faaf30e55522bba2b56d9c46689233205d7717, 68e3cd4ecb8603936cccdc338929130045df2e57, 75c87e2ac6149abf44bdde0dd6d541763ddb0dff, 8c8aa473fe6eb46a4bf99f3ea2dbe52bf0c1a1f0
Vendor Advisory: https://git.kernel.org/stable/c/1640dcf383cdba52be8b28d2a1a2aa7ef7a30c98
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix. 2. Check your distribution's security advisories for specific patched versions. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable F2FS module
linuxPrevent loading of F2FS kernel module if not needed
echo 'install f2fs /bin/true' >> /etc/modprobe.d/disable-f2fs.conf
rmmod f2fs
Restrict filesystem mounting
linuxLimit who can mount filesystems using sudoers or other access controls
🧯 If You Can't Patch
- Avoid using F2FS filesystem for any storage
- Implement strict access controls to prevent untrusted users from mounting filesystems
🔍 How to Verify
Check if Vulnerable:
Check if F2FS module is loaded: lsmod | grep f2fs. Check kernel version against patched versions from your distribution.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to patched version and F2FS module version matches patched kernel.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- KASAN reports mentioning f2fs_get_node_info or current_nat_addr
- System crashes when accessing F2FS filesystems
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for kernel panic events or KASAN reports containing 'f2fs' or 'slab-out-of-bounds'🔗 References
- https://git.kernel.org/stable/c/1640dcf383cdba52be8b28d2a1a2aa7ef7a30c98
- https://git.kernel.org/stable/c/20faaf30e55522bba2b56d9c46689233205d7717
- https://git.kernel.org/stable/c/68e3cd4ecb8603936cccdc338929130045df2e57
- https://git.kernel.org/stable/c/75c87e2ac6149abf44bdde0dd6d541763ddb0dff
- https://git.kernel.org/stable/c/8c8aa473fe6eb46a4bf99f3ea2dbe52bf0c1a1f0
- https://git.kernel.org/stable/c/be0155202e431f3007778568a72432c68f8946ba
- https://git.kernel.org/stable/c/c559a8d840562fbfce9f318448dda2f7d3e6d8e8
- https://git.kernel.org/stable/c/1640dcf383cdba52be8b28d2a1a2aa7ef7a30c98
- https://git.kernel.org/stable/c/20faaf30e55522bba2b56d9c46689233205d7717
- https://git.kernel.org/stable/c/68e3cd4ecb8603936cccdc338929130045df2e57
- https://git.kernel.org/stable/c/75c87e2ac6149abf44bdde0dd6d541763ddb0dff
- https://git.kernel.org/stable/c/8c8aa473fe6eb46a4bf99f3ea2dbe52bf0c1a1f0
- https://git.kernel.org/stable/c/be0155202e431f3007778568a72432c68f8946ba
- https://git.kernel.org/stable/c/c559a8d840562fbfce9f318448dda2f7d3e6d8e8
