Linux Kernel up to 7.2.4/7.3-rc1 Nouveau Dmem Migration drm/nouveau/dmem.c size memory leak

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.4/7.3-rc1. It has been declared as problematic. Affected by this vulnerability is the function nouveau_dmem_migrate_to_ram/nouveau_dmem_migrate_copy_one of the file drm/nouveau/dmem.c of the component Nouveau Dmem Migration. Such manipulation of the argument size leads to memory leak. This vulnerability is traded as CVE-2026-89804. An attack has to be approached locally. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 7.2.4/7.3-rc1. Affected by this issue is the function nouveau_dmem_migrate_to_ram/nouveau_dmem_migrate_copy_one of the file drm/nouveau/dmem.c of the component Nouveau Dmem Migration. The manipulation of the argument size with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/dmem: fix mismatched DMA unmap size for large folios Device-private THP migration maps migration buffers with page_size() and records that length in dma_info->size. For a compound folio page_size() is PAGE_SIZE << order, but two teardown sites still pass a literal PAGE_SIZE to dma_unmap_page(): - nouveau_dmem_migrate_to_ram() on the success path, and - nouveau_dmem_migrate_copy_one() on the copy-error path. For an order > 0 folio this unmaps less than was mapped, leaking the remainder of the IOMMU/IOVA mapping. The other unmap sites, in nouveau_dmem_migrate_chunk() and nouveau_dmem_evict_chunk(), already use the saved size; use it here too.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-89804 since 09/11/2026. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 7.2.5 or 7.3-rc2 eliminates this vulnerability. Applying the patch 4deb29b9d33bfdb3de4d2d9944947ecf77221e42/caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f 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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