CVE-2023-35828
📋 TL;DR
A use-after-free vulnerability in the Renesas USB3 gadget driver in Linux kernel versions before 6.3.2 allows local attackers to potentially execute arbitrary code or cause denial of service. This affects systems using the renesas_usb3 driver, typically on embedded devices with Renesas USB3 controllers. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Linux kernel
📦 What is this software?
H300s by Netapp
H410c by Netapp
H410s by Netapp
H500s by Netapp
H700s by Netapp
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
Local privilege escalation to kernel-level code execution, potentially leading to full system compromise.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
Limited impact if proper access controls prevent local users from accessing USB gadget functionality.
🎯 Exploit Status
Requires local access and knowledge of driver internals. No public exploits known as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel 6.3.2 and later
Vendor Advisory: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.2
Restart Required: Yes
Instructions:
1. Update kernel to version 6.3.2 or later. 2. For distributions: apply backported patches from your vendor. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable Renesas USB3 gadget driver
linuxRemove or disable the vulnerable driver module if not needed
modprobe -r renesas_usb3
echo 'blacklist renesas_usb3' > /etc/modprobe.d/disable-renesas-usb3.conf
🧯 If You Can't Patch
- Restrict local user access to systems with vulnerable driver
- Implement strict access controls and monitoring for USB gadget operations
🔍 How to Verify
Check if Vulnerable:
Check kernel version: uname -r. If version is < 6.3.2 and renesas_usb3 module is loaded, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is >= 6.3.2 and check that renesas_usb3 module is from patched version.📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages related to renesas_usb3
- System crashes or panics after USB gadget operations
Network Indicators:
- None - local vulnerability only
SIEM Query:
search 'kernel.*renesas_usb3.*Oops' OR 'kernel.*panic'🔗 References
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b947f8769be8b8181dc795fd292d3e7120f5204
- https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html
- https://lore.kernel.org/all/20230327121700.52d881e0%40canb.auug.org.au/
- https://lore.kernel.org/lkml/CAJedcCwkuznS1kSTvJXhzPoavcZDWNhNMshi-Ux0spSVRwU=RA%40mail.gmail.com/T/
- https://security.netapp.com/advisory/ntap-20230803-0002/
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b947f8769be8b8181dc795fd292d3e7120f5204
- https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html
- https://lore.kernel.org/all/20230327121700.52d881e0%40canb.auug.org.au/
- https://lore.kernel.org/lkml/CAJedcCwkuznS1kSTvJXhzPoavcZDWNhNMshi-Ux0spSVRwU=RA%40mail.gmail.com/T/
- https://security.netapp.com/advisory/ntap-20230803-0002/
