CVE-2025-38337
📋 TL;DR
This CVE addresses a null pointer dereference and data race condition in the Linux kernel's jbd2 journaling subsystem. Attackers could potentially cause kernel crashes or trigger undefined behavior, affecting systems using ext4 filesystems with journaling enabled. This vulnerability impacts Linux systems running vulnerable kernel versions.
💻 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
Kernel panic leading to system crash and denial of service, potentially allowing privilege escalation if combined with other vulnerabilities.
Likely Case
System instability, kernel crashes, or data corruption in filesystem operations, resulting in denial of service.
If Mitigated
Minimal impact with proper kernel hardening and isolation, though potential for system instability remains.
🎯 Exploit Status
Requires ability to trigger specific jbd2 journal operations, likely through local filesystem manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing the referenced git commits (23361b479f2700c00960d3ae9cdc8ededa762d47 and others)
Vendor Advisory: https://git.kernel.org/stable/c/23361b479f2700c00960d3ae9cdc8ededa762d47
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 ext4 journaling
linuxMount ext4 filesystems with journaling disabled (not recommended for production)
mount -t ext4 -o data=writeback /dev/sdX /mountpoint
🧯 If You Can't Patch
- Restrict local user access to minimize attack surface
- Implement strict process isolation and resource limits
🔍 How to Verify
Check if Vulnerable:
Check kernel version against affected ranges and verify if jbd2 module is loadedCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the specific git commit hashes mentioned in references📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- Filesystem corruption errors
- jbd2/journal related kernel oops
Network Indicators:
- None - local vulnerability only
SIEM Query:
kernel:panic OR kernel:oops AND (jbd2 OR journal)🔗 References
- https://git.kernel.org/stable/c/23361b479f2700c00960d3ae9cdc8ededa762d47
- https://git.kernel.org/stable/c/2e7c64d7a92c031d016f11c8e8cb05131ab7b75a
- https://git.kernel.org/stable/c/43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e
- https://git.kernel.org/stable/c/5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5
- https://git.kernel.org/stable/c/a377996d714afb8d4d5f4906336f78510039da29
- https://git.kernel.org/stable/c/af98b0157adf6504fade79b3e6cb260c4ff68e37
- https://git.kernel.org/stable/c/ec669e5bf409f16e464bfad75f0ba039a45de29a
- https://git.kernel.org/stable/c/f78b38af3540b4875147b7b884ee11a27b3dbf4c
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
