CVE-2023-53395
📋 TL;DR
This CVE-2023-53395 is a Linux kernel vulnerability in the ACPICA subsystem where the ASL Timer instruction lacks proper operand validation, causing an array index out-of-bounds error. This could allow local attackers to crash the system or potentially execute arbitrary code. Affected systems are those running vulnerable Linux kernel versions with ACPI support.
💻 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 →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 to denial of service if proper kernel hardening and privilege separation are in place.
🎯 Exploit Status
Exploitation requires local access and knowledge of triggering the vulnerable ASL Timer instruction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commit 90310989a0790032f5a0140741ff09b545af4bc5 or later
Vendor Advisory: https://git.kernel.org/stable/c/23c67fa615c52712bfa02a6dfadbd4656c87c066
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable ACPI if not needed
linuxRemove ACPI support from kernel boot parameters if system doesn't require it
Edit /etc/default/grub and add 'acpi=off' to GRUB_CMDLINE_LINUX
Run 'update-grub' (or equivalent)
Reboot
🧯 If You Can't Patch
- Restrict local user access to minimize attack surface
- Implement kernel module signing and disable module loading to prevent post-exploitation
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if ACPI Timer instruction handling is vulnerable by examining kernel source or distribution advisoriesCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commit 90310989a0790032f5a0140741ff09b545af4bc5📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- UBSAN array-index-out-of-bounds errors in dmesg
- ACPI interpreter errors
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for 'UBSAN: array-index-out-of-bounds' and 'acpica/dswexec.c' in kernel logs🔗 References
- https://git.kernel.org/stable/c/23c67fa615c52712bfa02a6dfadbd4656c87c066
- https://git.kernel.org/stable/c/2f2a5905303ae230b5159fcd8cdcd5b3e7ad5e2d
- https://git.kernel.org/stable/c/3a21ffdbc825e0919db9da0e27ee5ff2cc8a863e
- https://git.kernel.org/stable/c/3bf4463e40a17a23f2f261dfd7fe23129bdd04a4
- https://git.kernel.org/stable/c/430787056dd3c591eb553d5c3b2717efcf307d4e
- https://git.kernel.org/stable/c/625c12dc04a607b79f180ef3ee5a12bf2e3324c0
- https://git.kernel.org/stable/c/b102113469487b460e9e77fe9e00d49c50fe8c86
- https://git.kernel.org/stable/c/e1f686930ee4b059c7baa3c3904b2401829f2589
