CVE-2024-26646 thermal: intel: hfi: Add syscore callbacks for system-wide PM
A Linux kernel flaw allows memory corruption during hibernation or deep suspend resume, potentially enabling code execution or system crashes.
- 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-2024-26646?
CVE-2024-26646 is a high-severity memory corruption vulnerability in Linux kernel, published on 26 Mar 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:
thermal: intel: hfi: Add syscore callbacks for system-wide PM
The kernel allocates a memory buffer and provides its location to the hardware, which uses it to update the HFI table. This allocation occurs during boot and remains constant throughout runtime.
When resuming from hibernation, the restore kernel allocates a second memory buffer and reprograms the HFI hardware with the new location as part of a normal boot. The location of the second memory buffer may differ from the one allocated by the image kernel.
When the restore kernel transfers control to the image kernel, its HFI buffer becomes invalid, potentially leading to memory corruption if the hardware writes to it (the hardware continues to use the buffer from the restore kernel).
It is also possible that the hardware "forgets" the address of the memory buffer when resuming from "deep" suspend. Memory corruption may also occur in such a scenario.
To prevent the described memory corruption, disable HFI when preparing to suspend or hibernate. Enable it when resuming.
Add syscore callbacks to handle the package of the boot CPU (packages of non-boot CPUs are handled via CPU offline). Syscore ops always run on the boot CPU. Additionally, HFI only needs to be disabled during "deep" suspend and hibernation. Syscore ops only run in these cases.
[ rjw: Comment adjustment, subject and changelog edits ]
Weakness: CWE-770
Which versions are affected by CVE-2024-26646?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26646?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2024-26646 being exploited?
There is no known exploitation of CVE-2024-26646 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-26646, DEBIAN-CVE-2024-26646, GHSA-wrwp-f8pq-q3qj, UBUNTU-CVE-2024-26646.