CVE-2022-49451
📋 TL;DR
This vulnerability in the Linux kernel's SCMI firmware subsystem involves an integer overflow when validating protocol enumeration responses. It could allow attackers to bypass security checks and potentially cause denial of service or system instability. Systems using affected Linux kernel versions with ARM SCMI firmware 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 →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 or system crash leading to denial of service, potentially allowing privilege escalation if combined with other vulnerabilities.
Likely Case
System instability or denial of service affecting SCMI-related functionality.
If Mitigated
Minimal impact with proper kernel hardening and privilege separation.
🎯 Exploit Status
Requires local access or ability to interact with SCMI interface. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits: 1052f22e127d0c34c3387bb389424ba1c61491ff, 2ccfcd7a09c826516edcfe464b05071961aada3f, 444a2d27fe9867d0da4b28fc45b793f32e099ab8, 6e7978695f4a6cbd83616b5a702b77fa2087b247, 8009120e0354a67068e920eb10dce532391361d0
Vendor Advisory: https://git.kernel.org/stable/c/1052f22e127d0c34c3387bb389424ba1c61491ff
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable SCMI subsystem
linuxDisable ARM System Control and Management Interface if not required
echo 'blacklist scmi' > /etc/modprobe.d/scmi-blacklist.conf
update-initramfs -u
🧯 If You Can't Patch
- Implement strict access controls to limit who can interact with SCMI interfaces
- Monitor system logs for unusual SCMI-related activity or system instability
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if SCMI subsystem is loaded: 'lsmod | grep scmi' and 'uname -r'Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits or check with distribution-specific security tools📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- SCMI subsystem errors in dmesg
- System instability reports
Network Indicators:
- None - local vulnerability
SIEM Query:
search 'kernel panic' OR 'scmi' OR 'firmware error' in system logs🔗 References
- https://git.kernel.org/stable/c/1052f22e127d0c34c3387bb389424ba1c61491ff
- https://git.kernel.org/stable/c/2ccfcd7a09c826516edcfe464b05071961aada3f
- https://git.kernel.org/stable/c/444a2d27fe9867d0da4b28fc45b793f32e099ab8
- https://git.kernel.org/stable/c/6e7978695f4a6cbd83616b5a702b77fa2087b247
- https://git.kernel.org/stable/c/8009120e0354a67068e920eb10dce532391361d0
- https://git.kernel.org/stable/c/98342148a8cd242855d7e257f298c966c96dba9f
- https://git.kernel.org/stable/c/b0e4bafac8963c2d85ee18d3d01f393735acceec
