# CVE-2022-49001: linux: In the Linux kernel, the following vulnerability has been resolved:  riscv: fix race when vmap stack overflow  Curren...

CVE-2022-49001 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49001, released October 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49001
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0019
- 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: fix race when vmap stack overflow  Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time.  To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is cleared, it means the shadow_stack isn't being used.  [Palmer: Add AQ to the swap, and also some comments.]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.12-1 | [DEBIAN-CVE-2022-49001](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49001.md) | Oct 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.12-1 | [DEBIAN-CVE-2022-49001](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49001.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.0.12-1 | [DEBIAN-CVE-2022-49001](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49001.md) | Oct 21, 2024 |

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