# CVE-2024-42293: linux: In the Linux kernel, the following vulnerability has been resolved:  arm64: mm: Fix lockless walks with static and dy...

CVE-2024-42293 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42293, released August 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42293
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 17, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  arm64: mm: Fix lockless walks with static and dynamic page-table folding  Lina reports random oopsen originating from the fast GUP code when 16K pages are used with 4-level page-tables, the fourth level being folded at runtime due to lack of LPA2.  In this configuration, the generic implementation of p4d_offset_lockless() will return a 'p4d_t *' corresponding to the 'pgd_t' allocated on the stack of the caller, gup_fast_pgd_range(). This is normally fine, but when the fourth level of page-table is folded at runtime, pud_offset_lockless() will offset from the address of the 'p4d_t' to calculate the address of the PUD in the same page-table page. This results in a stray stack read when the 'p4d_t' has been allocated on the stack and can send the walker into the weeds.  Fix the problem by providing our own definition of p4d_offset_lockless() when CONFIG_PGTABLE_LEVELS <= 4 which returns the real page-table pointer rather than the address of the local stack variable.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.3-1 | [DEBIAN-CVE-2024-42293](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42293.md) | Aug 17, 2024 |
| Linux | linux Debian 14 | 6.10.3-1 | [DEBIAN-CVE-2024-42293](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42293.md) | Aug 17, 2024 |

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