CVE-2023-53357
📋 TL;DR
This CVE-2023-53357 is a slab-out-of-bounds read vulnerability in the Linux kernel's md/raid10 subsystem. It allows local attackers to read kernel memory beyond allocated boundaries, potentially leaking sensitive information. Systems using Linux kernel with md RAID10 functionality 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 →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 privilege escalation or system crash, potentially enabling full system compromise.
Likely Case
Kernel panic or system crash causing denial of service, with possible information disclosure of kernel memory contents.
If Mitigated
Limited impact if proper access controls prevent local user access to /sys/block/md*/bitmap_set_bits interface.
🎯 Exploit Status
Requires local access and ability to write to specific sysfs interface. Exploitation requires understanding of kernel memory layout.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Multiple stable kernel versions with commits: 152bb26796ff, 301867b1c168, 374fb914304d, 39fa14e824ac, a134dd582c0d
Vendor Advisory: https://git.kernel.org/stable/c/152bb26796ff054af50b2ee1b3ca56e364e4f61b
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Restrict access to md sysfs interface
linuxLimit access to /sys/block/md*/bitmap_set_bits to prevent triggering the vulnerability
chmod 600 /sys/block/md*/bitmap_set_bits
chown root:root /sys/block/md*/bitmap_set_bits
Disable md RAID10 bitmap if not needed
linuxRemove bitmap functionality from md RAID10 arrays if not required for operation
echo none > /sys/block/md*/bitmap/location
🧯 If You Can't Patch
- Implement strict access controls on /sys/block/md* interfaces
- Monitor system logs for access attempts to md bitmap interfaces
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with patched versions from your distribution. Check if md RAID10 devices exist: ls -la /sys/block/md*Check Version:
uname -rVerify Fix Applied:
Verify kernel version after update matches patched version. Check git commit history for the fix commits in your kernel source.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes related to md/raid10
- Access to /sys/block/md*/bitmap_set_bits in audit logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
search 'kernel: BUG:' OR 'kernel: general protection fault' OR 'md/raid10' in system logs🔗 References
- https://git.kernel.org/stable/c/152bb26796ff054af50b2ee1b3ca56e364e4f61b
- https://git.kernel.org/stable/c/301867b1c16805aebbc306aafa6ecdc68b73c7e5
- https://git.kernel.org/stable/c/374fb914304d9b500721007f3837ea8f1f9a2418
- https://git.kernel.org/stable/c/39fa14e824acfd470db4f42c354297456bd82b53
- https://git.kernel.org/stable/c/a134dd582c0d5b6068efa308bd485cf1d00b3f65
- https://git.kernel.org/stable/c/b0b971fe7d61411ede63c3291764dbde1577ef2c
- https://git.kernel.org/stable/c/be1a3ec63a840cc9e59a033acf154f56255699a1
- https://git.kernel.org/stable/c/bea301c046110bf421a3ce153fb868cb8d618e90
