Linux Kernel up to 7.2.4/7.3-rc1 Device Memory Migration mm/migrate_device migrate_device_range out-of-bounds write

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2.4/7.3-rc1. Affected by this vulnerability is the function migrate_device_range of the file mm/migrate_device of the component Device Memory Migration. Executing a manipulation can lead to out-of-bounds write. This vulnerability is registered as CVE-2026-89967. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.4/7.3-rc1. It has been declared as very critical. This vulnerability affects the function migrate_device_range of the file mm/migrate_device of the component Device Memory Migration. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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()

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-89967 since 09/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 7.2.5 or 7.3-rc2 eliminates this vulnerability. Applying the patch 99186b185c245f5987d7f8715d5504c8d8cc04a0/dc41e961a269f2ca4196e669d6d8e05480899cd4 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.3-rc1

License

• open-source

Website

• Vendor: https://www.kernel.org/

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