Debian: CVE-2022-49004: linux -- security update

Debian: CVE-2022-49004: linux -- security update

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

10/23/2024

Created

10/24/2024

Added

10/23/2024

Modified

01/30/2025

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.

Solution(s)

• debian-upgrade-linux

References

• https://attackerkb.com/topics/cve-2022-49004
• CVE - 2022-49004