# CVE-2024-41021: linux: In the Linux kernel, the following vulnerability has been resolved:  s390/mm: Fix VM_FAULT_HWPOISON handling in do_ex...

CVE-2024-41021 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-41021, released July 29, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-41021
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception()  There is no support for HWPOISON, MEMORY_FAILURE, or ARCH_HAS_COPY_MC on s390. Therefore we do not expect to see VM_FAULT_HWPOISON in do_exception().  However, since commit af19487f00f3 ("mm: make PTE_MARKER_SWAPIN_ERROR more general"), it is possible to see VM_FAULT_HWPOISON in combination with PTE_MARKER_POISONED, even on architectures that do not support HWPOISON otherwise. In this case, we will end up on the BUG() in do_exception().  Fix this by treating VM_FAULT_HWPOISON the same as VM_FAULT_SIGBUS, similar to x86 when MEMORY_FAILURE is not configured. Also print unexpected fault flags, for easier debugging.  Note that VM_FAULT_HWPOISON_LARGE is not expected, because s390 cannot support swap entries on other levels than PTE level.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.12-1 | [DEBIAN-CVE-2024-41021](https://patchblox.com/security/data/fix/linux/debian-cve-2024-41021.md) | Jul 29, 2024 |
| Linux | linux Debian 14 | 6.9.12-1 | [DEBIAN-CVE-2024-41021](https://patchblox.com/security/data/fix/linux/debian-cve-2024-41021.md) | Jul 29, 2024 |

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