CVE-2024-50141 ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context
A Linux kernel bug causes a paging request exception when calling PRM handlers due to incorrect memory mapping, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-50141?
CVE-2024-50141 is a high-severity vulnerability in Linux kernel, published on 7 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context
PRMT needs to find the correct type of block to translate the PA-VA mapping for EFI runtime services.
The issue arises because the PRMT is finding a block of type EFI_CONVENTIONAL_MEMORY, which is not appropriate for runtime services as described in Section 2.2.2 (Runtime Services) of the UEFI Specification [1]. Since the PRM handler is a type of runtime service, this causes an exception when the PRM handler is called.
[Firmware Bug]: Unable to handle paging request in EFI runtime service WARNING: CPU: 22 PID: 4330 at drivers/firmware/efi/runtime-wrappers.c:341 __efi_queue_work+0x11c/0x170 Call trace:
Let PRMT find a block with EFI_MEMORY_RUNTIME for PRM handler and PRM context.
If no suitable block is found, a warning message will be printed, but the procedure continues to manage the next PRM handler.
However, if the PRM handler is actually called without proper allocation, it would result in a failure during error handling.
By using the correct memory types for runtime services, ensure that the PRM handler and the context are properly mapped in the virtual address space during runtime, preventing the paging request error.
The issue is really that only memory that has been remapped for runtime by the firmware can be used by the PRM handler, and so the region needs to have the EFI_MEMORY_RUNTIME attribute.
[ rjw: Subject and changelog edits ]
Which versions are affected by CVE-2024-50141?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50141?
Apply the vendor's patch.
Is CVE-2024-50141 being exploited?
There is no known exploitation of CVE-2024-50141 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-53609, AZL-53639, BELL-CVE-2024-50141, DEBIAN-CVE-2024-50141, GHSA-h3fv-6wg7-93g2, UBUNTU-CVE-2024-50141.