CVE-2022-48860
📋 TL;DR
This CVE describes a memory leak vulnerability in the Linux kernel's xemaclite Ethernet driver. When the driver fails to properly release a reference count on a device tree node during error handling, it can cause gradual memory exhaustion. This affects systems using the Xilinx Ethernet Lite driver in the Linux kernel.
💻 Affected Systems
- Linux kernel with Xilinx Ethernet Lite (xemaclite) driver
📦 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
Sustained exploitation could lead to kernel memory exhaustion, causing system instability, denial of service, or potential kernel crashes.
Likely Case
Gradual memory leak over time leading to reduced system performance and eventual denial of service requiring system reboot.
If Mitigated
Minimal impact with proper memory monitoring and regular system maintenance.
🎯 Exploit Status
Exploitation requires specific hardware configuration and driver loading. This is a reliability issue rather than a security bypass.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits: 1852854ee349, 5e7c402892e1, 669172ce9766, 8609e29611be, 8ee065a7a9b6
Vendor Advisory: https://git.kernel.org/stable/c/1852854ee349881efb78ccdbbb237838975902e4
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check your distribution's security advisories for backported patches. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable xemaclite driver
linuxPrevent loading of the vulnerable driver if not needed
echo 'blacklist xemaclite' >> /etc/modprobe.d/blacklist.conf
rmmod xemaclite
🧯 If You Can't Patch
- Monitor system memory usage for unusual increases
- Implement regular system reboots to clear potential memory leaks
🔍 How to Verify
Check if Vulnerable:
Check if xemaclite driver is loaded: lsmod | grep xemaclite. Check kernel version against distribution security advisories.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits or check with distribution package manager that security update is applied.📡 Detection & Monitoring
Log Indicators:
- Kernel oom-killer messages
- System memory exhaustion warnings in syslog
- Driver initialization failures
Network Indicators:
- None specific - this is not a network exploitable vulnerability
SIEM Query:
source="kernel" AND ("out of memory" OR "oom-killer" OR "xemaclite")🔗 References
- https://git.kernel.org/stable/c/1852854ee349881efb78ccdbbb237838975902e4
- https://git.kernel.org/stable/c/5e7c402892e189a7bc152b125e72261154aa585d
- https://git.kernel.org/stable/c/669172ce976608b25a2f76f3c65d47f042d125c9
- https://git.kernel.org/stable/c/8609e29611befc4bfbe7a91bb50fc65ae72ff549
- https://git.kernel.org/stable/c/8ee065a7a9b6a3976c16340503677efc4d8351f6
- https://git.kernel.org/stable/c/979b418b96e35f07136f77962ccfaa54cf3e30e1
- https://git.kernel.org/stable/c/b19ab4b38b06aae12442b2de95ccf58b5dc53584
- https://git.kernel.org/stable/c/b7220f8e9d6c6b9594ddfb3125dad938cd478b1f
- https://git.kernel.org/stable/c/1852854ee349881efb78ccdbbb237838975902e4
- https://git.kernel.org/stable/c/5e7c402892e189a7bc152b125e72261154aa585d
- https://git.kernel.org/stable/c/669172ce976608b25a2f76f3c65d47f042d125c9
- https://git.kernel.org/stable/c/8609e29611befc4bfbe7a91bb50fc65ae72ff549
- https://git.kernel.org/stable/c/8ee065a7a9b6a3976c16340503677efc4d8351f6
- https://git.kernel.org/stable/c/979b418b96e35f07136f77962ccfaa54cf3e30e1
- https://git.kernel.org/stable/c/b19ab4b38b06aae12442b2de95ccf58b5dc53584
- https://git.kernel.org/stable/c/b7220f8e9d6c6b9594ddfb3125dad938cd478b1f
