GHSA-F67X-82W6-7JJX
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:30In 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.
{
"affected": [],
"aliases": [
"CVE-2026-89804"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:16:45Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/dmem: fix mismatched DMA unmap size for large folios\n\nDevice-private THP migration maps migration buffers with page_size()\nand records that length in dma_info-\u003esize. For a compound folio\npage_size() is PAGE_SIZE \u003c\u003c order, but two teardown sites still pass a\nliteral PAGE_SIZE to dma_unmap_page():\n\n - nouveau_dmem_migrate_to_ram() on the success path, and\n - nouveau_dmem_migrate_copy_one() on the copy-error path.\n\nFor an order \u003e 0 folio this unmaps less than was mapped, leaking the\nremainder of the IOMMU/IOVA mapping. The other unmap sites, in\nnouveau_dmem_migrate_chunk() and nouveau_dmem_evict_chunk(), already\nuse the saved size; use it here too.",
"id": "GHSA-f67x-82w6-7jjx",
"modified": "2026-09-16T15:30:57Z",
"published": "2026-09-16T12:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89804"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4deb29b9d33bfdb3de4d2d9944947ecf77221e42"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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