CVE-2024-35936
📋 TL;DR
This CVE addresses a Linux kernel Btrfs filesystem corruption vulnerability where an unhandled error in chunk tree lookup could cause system instability. It affects Linux systems using Btrfs filesystem. The vulnerability requires local access to trigger.
💻 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 →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
System crash or kernel panic leading to denial of service and potential data corruption in Btrfs filesystems.
Likely Case
Local denial of service through system instability or crash when specific Btrfs operations are performed.
If Mitigated
Minimal impact with proper access controls preventing local users from triggering the vulnerable code path.
🎯 Exploit Status
Exploitation requires local access and specific conditions to trigger the unhandled error path. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in Linux kernel stable releases via the provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/0d23b34c68c46cd225b55868bc8a269e3134816d
Restart Required: Yes
Instructions:
1. Update Linux kernel to a version containing the fix. 2. Check your distribution's security advisories for specific patched kernel versions. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable Btrfs filesystem
linuxAvoid using Btrfs filesystem if not required
# Not recommended for production systems using Btrfs
🧯 If You Can't Patch
- Restrict local user access to systems using Btrfs filesystem
- Monitor system logs for Btrfs-related errors or crashes
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if Btrfs is in use: 'uname -r' and 'cat /proc/filesystems | grep btrfs'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated to a patched version and check git commit history for the fix📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Btrfs error messages in dmesg or system logs
- System crash reports
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for 'kernel panic' OR 'btrfs' AND 'error' OR 'crash' in system logs🔗 References
- https://git.kernel.org/stable/c/0d23b34c68c46cd225b55868bc8a269e3134816d
- https://git.kernel.org/stable/c/1f9212cdbd005bc55f2b7422e7b560d9c02bd1da
- https://git.kernel.org/stable/c/36c2a2863bc3896243eb724dc3fd4cf9aea633f2
- https://git.kernel.org/stable/c/576164bd01bd795f8b09fb194b493103506b33c9
- https://git.kernel.org/stable/c/7411055db5ce64f836aaffd422396af0075fdc99
- https://git.kernel.org/stable/c/87299cdaae757f3f41212146cfb5b3af416b8385
- https://git.kernel.org/stable/c/bebd9e0ff90034875c5dfe4bd514fd7055fc7a89
- https://git.kernel.org/stable/c/d1ffa4ae2d591fdd40471074e79954ec45f147f7
- https://git.kernel.org/stable/c/0d23b34c68c46cd225b55868bc8a269e3134816d
- https://git.kernel.org/stable/c/1f9212cdbd005bc55f2b7422e7b560d9c02bd1da
- https://git.kernel.org/stable/c/36c2a2863bc3896243eb724dc3fd4cf9aea633f2
- https://git.kernel.org/stable/c/576164bd01bd795f8b09fb194b493103506b33c9
- https://git.kernel.org/stable/c/7411055db5ce64f836aaffd422396af0075fdc99
- https://git.kernel.org/stable/c/87299cdaae757f3f41212146cfb5b3af416b8385
- https://git.kernel.org/stable/c/bebd9e0ff90034875c5dfe4bd514fd7055fc7a89
- https://git.kernel.org/stable/c/d1ffa4ae2d591fdd40471074e79954ec45f147f7
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
