CVE-2022-50315
📋 TL;DR
This CVE-2022-50315 is an array index out-of-bounds vulnerability in the Linux kernel's AHCI driver that can cause kernel memory corruption. It affects systems using SATA Port Multipliers with more than 8 ports, potentially leading to system crashes or kernel panics. The vulnerability is triggered during SATA Port Multiplier initialization when the driver attempts to access memory beyond allocated bounds.
💻 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 →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 memory corruption leading to system crash, kernel panic, or potential privilege escalation if combined with other vulnerabilities.
Likely Case
System instability, kernel panic, or denial of service when using SATA Port Multipliers with more than 8 ports.
If Mitigated
No impact if not using SATA Port Multipliers or using Port Multipliers with 8 or fewer ports.
🎯 Exploit Status
Exploitation requires specific hardware configuration (SATA Port Multiplier with >8 ports) and local access. No known weaponized exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in kernel commits: 1e41e693f458eef2d5728207dbd327cd3b16580a, 303d0f761431d848dd8d7ff9fd9b8c101879cabe, 383b7c50f5445ff8dbbf03080905648d6980c39d, 67a00c299c5c143817c948fbc7de1a2fa1af38fb, 8fbe13de1cc7cef2564be3cbf60400b33eee023b
Vendor Advisory: https://git.kernel.org/stable/c/1e41e693f458eef2d5728207dbd327cd3b16580a
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 SATA Port Multiplier support
linuxPrevent the vulnerable code path by disabling Port Multiplier support in kernel configuration
echo 'options libahci ignore_pmp=1' > /etc/modprobe.d/ahci.conf
update-initramfs -u
reboot
🧯 If You Can't Patch
- Avoid using SATA Port Multipliers with more than 8 ports
- Monitor system logs for UBSAN array-index-out-of-bounds errors related to libahci
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if using SATA Port Multipliers. Look for UBSAN errors in dmesg: 'dmesg | grep -i 'array-index-out-of-bounds.*libahci''Check Version:
uname -rVerify Fix Applied:
Check kernel version includes fix commits: 'uname -r' and verify with distribution security advisory📡 Detection & Monitoring
Log Indicators:
- UBSAN: array-index-out-of-bounds in /build/linux-*/linux-*/drivers/ata/libahci.c
- Kernel panic or system crash during SATA initialization
Network Indicators:
- None - this is a local storage driver issue
SIEM Query:
source="kernel" AND "array-index-out-of-bounds" AND "libahci"🔗 References
- https://git.kernel.org/stable/c/1e41e693f458eef2d5728207dbd327cd3b16580a
- https://git.kernel.org/stable/c/303d0f761431d848dd8d7ff9fd9b8c101879cabe
- https://git.kernel.org/stable/c/383b7c50f5445ff8dbbf03080905648d6980c39d
- https://git.kernel.org/stable/c/67a00c299c5c143817c948fbc7de1a2fa1af38fb
- https://git.kernel.org/stable/c/8fbe13de1cc7cef2564be3cbf60400b33eee023b
- https://git.kernel.org/stable/c/d6314d5f68764550c84d732ce901ddd3ac6b415f
- https://git.kernel.org/stable/c/da2ea4a961d9f89ed248734e7032350c260dc3a3
- https://git.kernel.org/stable/c/f70bd4339cb68bc7e206af4c922bc0d249244403
