CVE-2024-57875
📋 TL;DR
This CVE addresses a use-after-free vulnerability in the Linux kernel's block layer where the conventional zones bitmap pointer (disk->conv_zones_bitmap) could be accessed after being freed during disk revalidation. This could lead to kernel memory corruption or crashes. The vulnerability affects Linux systems using zoned block devices.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash, potential privilege escalation if combined with other vulnerabilities, or data corruption on zoned storage devices.
Likely Case
System instability, kernel crashes, or denial of service affecting zoned block device operations.
If Mitigated
Minimal impact with proper kernel protections and limited zoned device usage.
🎯 Exploit Status
Exploitation requires local access and specific operations on zoned block devices. Race condition makes reliable exploitation challenging.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits 493326c4f10cc71a42c27fdc97ce112182ee4cbc and d7cb6d7414ea1b33536fa6d11805cb8dceec1f97)
Vendor Advisory: https://git.kernel.org/stable/c/493326c4f10cc71a42c27fdc97ce112182ee4cbc
Restart Required: Yes
Instructions:
1. Update to a patched kernel version from your distribution's repositories. 2. Rebuild kernel if using custom kernel. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable zoned block device usage
linuxAvoid using zoned storage devices (SMR HDDs, ZNS SSDs) until patched.
🧯 If You Can't Patch
- Restrict access to systems using zoned storage devices to trusted users only
- Monitor systems for kernel crashes or instability related to storage operations
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if using zoned block devices with 'lsblk -o NAME,ZONED' or 'blkzone report /dev/device'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or is newer than patched versions📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes during storage operations
- dmesg errors related to block layer or memory corruption
SIEM Query:
Search for kernel panic events or storage-related error messages in system logs