CVE-2024-26646

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 ]

Notes