201 lines
12 KiB
JSON
201 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90387",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.809Z",
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"datePublished": "2026-09-17T16:09:22.493Z",
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"dateUpdated": "2026-10-19T09:02:50.001Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:02:50.001Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nswiotlb: Preserve allocation virtual address for dynamic pools\n\nswiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted\npool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the\natomic pool is backed by remapped virtual addresses, which are not the same\nas the direct-map addresses returned by phys_to_virt().\n\nswiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address\nfrom the physical start address. For atomic-pool backed allocations this\nstores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes\nthat address to dma_free_from_pool(), which will fail to recognize the\nchunk\n\nPass the virtual address returned by the allocation path into\nswiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This\nkeeps the pool free path using the same virtual address as the allocator."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The mismatch is kernel-internal: swiotlb_init_io_tlb_pool() stored phys_to_virt(start) instead of the remapped cpu_addr from dma_alloc_from_pool(), not bytes from a protocol message. Local I/O reaches it via dma_map_page_attrs() → dma_direct_map_phys() → swiotlb_map() → swiotlb_tbl_map_single() → swiotlb_find_slots() GFP_NOWAIT transient allocation.\nAC:L - On an ARM64 realm guest force_dma_unencrypted() is true, so every GFP_NOWAIT swiotlb_alloc_tlb() in swiotlb_find_slots() uses dma_alloc_from_pool() and CONFIG_DMA_DIRECT_REMAP makes that vaddr differ from phys_to_virt(); filling io_tlb_default_mem then unmapping is attacker-driven I/O with no race.\nPR:L - No capability check gates dma_map_page_attrs() or swiotlb_tbl_map_single(). An unprivileged user triggers the GFP_NOWAIT transient pool by ordinary I/O, e.g. virtio-blk virtqueue_add_sgs() → virtqueue_map_page_attrs(), or sendmsg on virtio-net, which bounce through SWIOTLB_FORCE on a CCA guest.\nUI:N - The attacker’s own map/unmap I/O allocates the transient pool and later dma_direct_unmap_phys() → __swiotlb_tbl_unmap_single() → swiotlb_del_transient() → swiotlb_dyn_free() → swiotlb_free_tlb(); no victim mount or other action is required.\nS:U - pool->start remains page_to_phys(tlb), so the device still DMAs to the allocated bounce pages. The defect is swiotlb_free_tlb() passing the linear phys_to_virt address into dma_free_from_pool()/__free_pages, corrupting the guest page allocator, not an IOMMU map of foreign pages or a realm/host escape.\nC:H - When dma_free_from_pool() rejects the linear address, swiotlb_free_tlb() still __free_pages()s those atomic-pool frames while gen_pool still owns them and dma_common_contiguous_remap() leaves a decrypted VM_DMA_COHERENT alias, so the pages can be reallocated with a stale kernel mapping.\nI:H - atomic_pool_expand() allocated one high-order compound page that gen_pool carved up; __free_pages(virt_to_page(linear_vaddr), get_order(tlb_size)) is a wrong-order or tail-page free of that block, corrupting buddy metadata and yielding an arbitrary write primitive.\nA:H - The same __free_pages() of a compound tail page or the wrong order produces bad-page handling, VM_BUG, or an oops, and any leftover coherent remap or reused frame later panics when touched."
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}
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]
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}
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],
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{
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"product": "Linux",
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"vendor": "Linux",
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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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"kernel/dma/swiotlb.c"
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"kernel/dma/swiotlb.c"
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"version": "6.6.157",
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"status": "unaffected",
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