CVE-2022-48696
📋 TL;DR
A buffer overflow vulnerability in the Linux kernel's regmap SPI subsystem could cause data corruption when SPI messages exceed maximum permitted size. This affects systems using regmap SPI drivers with specific configurations. The vulnerability requires local access or kernel module interaction to exploit.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic, system crash, or data corruption leading to system instability and potential privilege escalation if combined with other vulnerabilities.
Likely Case
SPI communication failures, data corruption in SPI-connected devices, or kernel crashes affecting system stability.
If Mitigated
Minor SPI communication issues or no impact if not using affected regmap SPI configurations.
🎯 Exploit Status
Requires local access and ability to interact with vulnerable regmap SPI configurations. No known public exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 15ff1f17847c19174b260bd7dd0de33edcebd45e and f5723cfc01932c7a8d5c78dbf7e067e537c91439
Vendor Advisory: https://git.kernel.org/stable/c/15ff1f17847c19174b260bd7dd0de33edcebd45e
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 after reboot.
🔧 Temporary Workarounds
Disable vulnerable regmap SPI configurations
linuxAvoid using regmap SPI drivers with max_raw_read/max_raw_write limits that don't account for address padding
🧯 If You Can't Patch
- Restrict local user access to systems using vulnerable regmap SPI configurations
- Monitor for kernel crashes or SPI communication failures as indicators of potential exploitation
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with distribution's security advisories. Systems using regmap SPI drivers with specific configurations are vulnerable.Check Version:
uname -rVerify Fix Applied:
Verify kernel version contains the fix commits or is newer than your distribution's patched version.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- SPI communication errors in kernel logs
- System crash reports
SIEM Query:
Search for kernel panic events or SPI subsystem errors in system logs