CVE-2024-47757
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in the Linux kernel's nilfs2 filesystem driver. The flaw occurs when checking b-tree deletions and could allow attackers to read kernel memory beyond allocated buffers. Systems using nilfs2 filesystems with affected kernel versions are vulnerable.
💻 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 memory disclosure leading to information leakage, potential privilege escalation via follow-on attacks, or kernel panic causing system crash.
Likely Case
Information disclosure of kernel memory contents, potentially revealing sensitive data or system state information.
If Mitigated
Limited impact due to the specific nilfs2 configuration requirement and the read-only nature of the vulnerability.
🎯 Exploit Status
Requires local access and ability to mount/create nilfs2 filesystems with specific configurations. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits listed in references)
Vendor Advisory: https://git.kernel.org/stable/c/257f9e5185eb6de83377caea686c306e22e871f2
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 kernel version matches patched release.
🔧 Temporary Workarounds
Disable nilfs2 module
linuxPrevent loading of nilfs2 kernel module to eliminate attack surface
echo 'install nilfs2 /bin/false' >> /etc/modprobe.d/disable-nilfs2.conf
rmmod nilfs2
Avoid nilfs2 filesystems
linuxDo not mount or use nilfs2 filesystems on vulnerable systems
Check /etc/fstab and remove nilfs2 entries
Avoid using mkfs.nilfs2
🧯 If You Can't Patch
- Restrict local user access to systems using nilfs2 filesystems
- Implement strict filesystem monitoring and audit nilfs2 usage
🔍 How to Verify
Check if Vulnerable:
Check if nilfs2 module is loaded: lsmod | grep nilfs2. Check kernel version against patched releases.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and nilfs2 module version matches patched kernel. Test with nilfs2 operations if necessary.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes when accessing nilfs2 filesystems
- Unexpected kernel memory access errors
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for: 'kernel: nilfs2' OR 'kernel: Oops' OR 'kernel: general protection fault' in system logs🔗 References
- https://git.kernel.org/stable/c/257f9e5185eb6de83377caea686c306e22e871f2
- https://git.kernel.org/stable/c/a33e967b681e088a125b979975c93e3453e686cd
- https://git.kernel.org/stable/c/a8abfda768b9f33630cfbc4af6c4214f1e5681b0
- https://git.kernel.org/stable/c/c4cbcc64bb31e67e02940ce060cc77f7180564cf
- https://git.kernel.org/stable/c/c4f8554996e8ada3be872dfb8f60e93bcf15fb27
- https://git.kernel.org/stable/c/d20674f31626e0596ae4c1d9401dfb6739b81b58
- https://git.kernel.org/stable/c/ed76d381dae125b81d09934e365391a656249da8
- https://git.kernel.org/stable/c/f3a9859767c7aea758976f5523903d247e585129
- https://git.kernel.org/stable/c/f9c96351aa6718b42a9f42eaf7adce0356bdb5e8
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
