# CVE-2026-74524: linux: In the Linux kernel, the following vulnerability has been resolved:  riscv: mm: Fix out-of-bounds page-table walk dur...

CVE-2026-74524 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-74524, released August 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-74524
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 15, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove  remove_pud_mapping() and remove_p4d_mapping() obtain a child table base with pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for addr.  RISC-V folds page-table levels at runtime. When a level is folded, its offset helper returns the parent entry itself, but the index can still be nonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39 folds both P4D and PUD, so memory hot-remove can descend into unrelated memory and pass an invalid page to __free_pages(). This can trigger:    kernel BUG at include/linux/mm.h:1810!   VM_BUG_ON_PAGE(page_ref_count(page) == 0)   arch_remove_memory+0x1e/0x5c   try_remove_memory+0x15e/0x200   remove_memory+0x24/0x3c  Only add the index when the corresponding page-table level is enabled, matching p4d_offset() and pud_offset().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.105-1 | [DEBIAN-CVE-2026-74524](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74524.md) | Aug 16, 2026 |
| Linux | linux Debian 14 | 7.1.8-1 | [DEBIAN-CVE-2026-74524](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74524.md) | Aug 16, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.107-1~deb12u1 | [DEBIAN-CVE-2026-74524](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74524.md) | Aug 16, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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