# CVE-2022-49004: linux: In the Linux kernel, the following vulnerability has been resolved:  riscv: Sync efi page table's kernel mappings bef...

CVE-2022-49004 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49004, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49004
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.12-1 | [DEBIAN-CVE-2022-49004](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49004.md) | Oct 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.12-1 | [DEBIAN-CVE-2022-49004](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49004.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.0.12-1 | [DEBIAN-CVE-2022-49004](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49004.md) | Oct 21, 2024 |

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