CVE-2022-49004

riscv: Sync efi page table's kernel mappings before switching

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: Sync efi page table's kernel mappings before switching The EFI page table is initially created as a copy of the kernel page table. With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area: if the stack is allocated in a new PGD (one that was not present at the moment of the efi page table creation or not synced in a previous vmalloc fault), the kernel will take a trap when switching to the efi page table when the vmalloc kernel stack is accessed, resulting in a kernel panic. Fix that by updating the efi kernel mappings before switching to the efi page table.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.06%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/fa7a7d185ef380546b4b1fed6f84f31dbae8cec7	patch
https://git.kernel.org/stable/c/96f479383d92944406d4b3f2bc03c2f640def9f1	patch
https://git.kernel.org/stable/c/3f105a742725a1b78766a55169f1d827732e62b8	patch

Frequently Asked Questions

What is the severity of CVE-2022-49004?: CVE-2022-49004 has been scored as a medium severity vulnerability.
How to fix CVE-2022-49004?: To fix CVE-2022-49004, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49004 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49004 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49004?: CVE-2022-49004 affects Linux Linux, Linux Linux.

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