CVE-2022-49004

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb91540d52a08b65eb6a2b09132e1bd54fa82754c < fa7a7d185ef380546b4b1fed6f84f31dbae8cec7affected
LinuxLinuxb91540d52a08b65eb6a2b09132e1bd54fa82754c < 96f479383d92944406d4b3f2bc03c2f640def9f1affected
LinuxLinuxb91540d52a08b65eb6a2b09132e1bd54fa82754c < 3f105a742725a1b78766a55169f1d827732e62b8affected
LinuxLinux5.10affected
LinuxLinux0 < 5.10unaffected
LinuxLinux5.15.82 <= 5.15.*unaffected
LinuxLinux6.0.12 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References