375 lines
17 KiB
JSON
375 lines
17 KiB
JSON
{
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"cveId": "CVE-2023-52801",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-21T15:19:24.247Z",
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"datePublished": "2024-05-21T15:31:13.700Z",
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"dateUpdated": "2026-08-05T09:11:28.903Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix missing update of domains_itree after splitting iopt_area\n\nIn iopt_area_split(), if the original iopt_area has filled a domain and is\nlinked to domains_itree, pages_nodes have to be properly\nreinserted. Otherwise the domains_itree becomes corrupted and we will UAF."
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},
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"lang": "en",
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"value": "AV:L - The bug is reached only through local ioctls on /dev/iommu or /dev/vfio/vfio (VFIO_IOMMU_UNMAP_DMA → iopt_cut_iova → iopt_area_split); there is no network or adjacent-network path.\nAC:L - The attacker fully controls the preconditions—disable large pages (VFIO_TYPE1_IOMMU or IOMMU_OPTION_HUGE_PAGES), map an IOVA range with a filled domain, then partial-unmap to force the split—so the domains_itree UAF is deterministic with no race or external condition.\nPR:L - iommufd_fops_open() has no capability check; access is only DAC on /dev/iommu (0660) or /dev/vfio/vfio (0666), routinely granted to unprivileged qemu/libvirt passthrough users, matching other iommufd CVEs scored PR:L.\nUI:N - The full map/set-iommu/partial-unmap sequence is issued by the attacker's own process with no victim interaction required.\nS:C - domains_itree tracks which iopt_areas hold DMA-mapped PFNs in live iommu_domains; leaving a freed area linked and then walking/removing from that tree corrupts IOMMU mapping bookkeeping and can unpin or mis-resolve pages still device-mapped, defeating the DMA isolation boundary.\nC:H - The commit documents a use-after-free on the freed iopt_area still linked in domains_itree; UAF of a sprayable kzalloc object enables arbitrary kernel memory disclosure, and corrupted domain PFN lookup can expose host pages to device DMA.\nI:H - The same UAF/tree corruption yields write primitives via interval-tree remove/insert on attacker-reclaimed memory and broken unpin/unmap of IOMMU-backed pages, enabling control-flow hijack and integrity compromise.\nA:H - Use-after-free on domains_itree walks causes kernel oops/panic, and interval-tree operations on a dangling freed node can hang or crash subsequent iommufd unmap/destroy paths."
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}
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]
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}
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],
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"drivers/iommu/iommufd/io_pagetable.c"
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}
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