# CVE-2024-42235: linux: In the Linux kernel, the following vulnerability has been resolved:  s390/mm: Add NULL pointer check to crst_table_fr...

CVE-2024-42235 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42235, released August 7, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42235
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 7, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  s390/mm: Add NULL pointer check to crst_table_free() base_crst_free()  crst_table_free() used to work with NULL pointers before the conversion to ptdescs.  Since crst_table_free() can be called with a NULL pointer (error handling in crst_table_upgrade() add an explicit check.  Also add the same check to base_crst_free() for consistency reasons.  In real life this should not happen, since order two GFP_KERNEL allocations will not fail, unless FAIL_PAGE_ALLOC is enabled and used.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.10-1 | [DEBIAN-CVE-2024-42235](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42235.md) | Aug 7, 2024 |
| Linux | linux Debian 14 | 6.9.10-1 | [DEBIAN-CVE-2024-42235](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42235.md) | Aug 7, 2024 |

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