# CVE-2024-38667: linux: In the Linux kernel, the following vulnerability has been resolved:  riscv: prevent pt_regs corruption for secondary...

CVE-2024-38667 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-38667, released June 24, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-38667
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  riscv: prevent pt_regs corruption for secondary idle threads  Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted.  Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.94-1 | [DEBIAN-CVE-2024-38667](https://patchblox.com/security/data/fix/linux/debian-cve-2024-38667.md) | Jun 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-38667](https://patchblox.com/security/data/fix/linux/debian-cve-2024-38667.md) | Jun 24, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-38667](https://patchblox.com/security/data/fix/linux/debian-cve-2024-38667.md) | Jun 24, 2024 |

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