CVE-2025-38141
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's device mapper (dm) subsystem when handling zoned block devices. It allows a local attacker to potentially crash the system or execute arbitrary code by triggering concurrent zone revalidation operations. Systems using zoned storage with dm-crypt or other device mapper configurations 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 →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to kernel compromise, system crash, or arbitrary code execution with kernel privileges.
Likely Case
Kernel panic or system crash causing denial of service, potentially leading to data corruption in zoned storage devices.
If Mitigated
Limited impact with proper access controls preventing local user access to affected systems.
🎯 Exploit Status
Exploitation requires local access and knowledge of zoned storage operations. Race condition makes timing critical.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel branches (commits: 37f53a2c60d0, d19bc1b4dd5f, f9c1bdf24615)
Vendor Advisory: https://git.kernel.org/stable/c/37f53a2c60d03743e0eacf7a0c01c279776fef4e
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution. 2. For custom kernels, apply commits 37f53a2c60d0, d19bc1b4dd5f, and f9c1bdf24615. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable zoned storage for device mapper
linuxAvoid using device mapper with zoned block devices if not required
Restrict access to block device ioctls
linuxLimit which users can perform block device operations via permissions
chmod 600 /dev/dm-*
setfacl -m u:root:rw /dev/dm-*
🧯 If You Can't Patch
- Restrict local user access to systems using zoned storage with device mapper
- Monitor for unusual block device operations and kernel panic logs
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if device mapper with zoned storage is in use: 'uname -r' and 'dmsetup status'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes patches: 'uname -r' should match patched version from your distribution📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- Oops messages in dmesg
- Crash reports in /var/log/messages or journalctl
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "use-after-free") AND ("dm" OR "device-mapper")