# CVE-2026-89967: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/migrate_device: avoid out-of-bounds writes fo...

CVE-2026-89967 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89967 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-89967
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm/migrate_device: avoid out-of-bounds writes for compound folios  migrate_device_range() and migrate_device_pfns() clear the entries following a compound folio so that the PFN arrays retain their page-granular representation.  If a compound folio extends beyond the end of the caller-provided range, the loops clear all following folio entries without limiting them to the number of slots remaining in the npages-sized array, causing an out-of-bounds write.  Do not proceed with a compound folio if its page-granular representation does not fit entirely in the remaining PFN array.  If this happens, drop any reference and lock acquired for the folio, clear the remaining entries, and stop collecting.  Observed with a KASAN x86 QEMU kernel using the HMM migrate_anon_huge_zero selftest.  Closing /dev/hmm_dmirror0 after migrating an anonymous huge page to device memory exercises:    dmirror_fops_release()     -> dmirror_device_evict_chunk()       -> migrate_device_range()

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89967](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89967.md) | Sep 23, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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