CVE-2022-49651
📋 TL;DR
This Linux kernel vulnerability in the SRCU (Sleepable Read-Copy-Update) subsystem could allow a use-after-free condition when cleaning up SRCU structures. Attackers could potentially exploit this to cause kernel crashes, privilege escalation, or arbitrary code execution. All systems running affected Linux kernel versions are vulnerable.
💻 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, system crash, privilege escalation to root, or arbitrary code execution in kernel context leading to complete system compromise.
Likely Case
Kernel crash or system instability causing denial of service, potentially leading to privilege escalation in specific configurations.
If Mitigated
System remains stable with no impact if patched or if vulnerable code paths aren't triggered.
🎯 Exploit Status
Exploitation requires local access and ability to trigger SRCU cleanup operations. Race condition exploitation adds complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/8ed00760203d8018bee042fbfe8e076579be2c2b
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from distribution vendor. 2. Apply kernel patches from git.kernel.org if compiling custom kernel. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
No practical workarounds
allThis is a core kernel vulnerability with no configuration-based workarounds
🧯 If You Can't Patch
- Restrict local user access and implement strict privilege separation
- Monitor systems for kernel crashes or unusual behavior indicating exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with distribution security advisories. Vulnerable if running unpatched kernel with SRCU functionality.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the git commit hashes: 8ed00760203d8018bee042fbfe8e076579be2c2b or e997dda6502eefbc1032d6b0da7b353c53344b07📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- Use-after-free warnings in kernel logs
- System crashes or unexpected reboots
Network Indicators:
- None - local vulnerability only
SIEM Query:
search for kernel panic or oops messages in system logs