{"cve":{"cve_id":"CVE-2026-46325","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00347,"epss_percentile":0.2646,"epss_as_of":"2026-06-23","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE\n\nThe current implementation incorrectly handles memory regions (MRs) with\npage sizes different from the system PAGE_SIZE. The core issue is that\nrxe_set_page() is called with mr->page_size step increments, but the\npage_list stores individual struct page pointers, each representing\nPAGE_SIZE of memory.\n\nib_sg_to_page() has ensured that when i>=1 either\na) SG[i-1].dma_end and SG[i].dma_addr are contiguous\nor\nb) SG[i-1].dma_end and SG[i].dma_addr are mr->page_size aligned.\n\nThis leads to incorrect iova-to-va conversion in scenarios:\n\n1) page_size < PAGE_SIZE (e.g., MR: 4K, system: 64K):\n   ibmr->iova = 0x181800\n   sg[0]: dma_addr=0x181800, len=0x800\n   sg[1]: dma_addr=0x173000, len=0x1000\n\n   Access iova = 0x181800 + 0x810 = 0x182010\n   Expected VA: 0x173010 (second SG, offset 0x10)\n   Before fix:\n     - index = (0x182010 >> 12) - (0x181800 >> 12) = 1\n     - page_offset = 0x182010 & 0xFFF = 0x10\n     - xarray[1] stores system page base 0x170000\n     - Resulting VA: 0x170000 + 0x10 = 0x170010 (wrong)\n\n2) page_size > PAGE_SIZE (e.g., MR: 64K, system: 4K):\n   ibmr->iova = 0x18f800\n   sg[0]: dma_addr=0x18f800, len=0x800\n   sg[1]: dma_addr=0x170000, len=0x1000\n\n   Access iova = 0x18f800 + 0x810 = 0x190010\n   Expected VA: 0x170010 (second SG, offset 0x10)\n   Before fix:\n     - index = (0x190010 >> 16) - (0x18f800 >> 16) = 1\n     - page_offset = 0x190010 & 0xFFFF = 0x10\n     - xarray[1] stores system page for dma_addr 0x170000\n     - Resulting VA: system page of 0x170000 + 0x10 = 0x170010 (wrong)\n\nYi Zhang reported a kernel panic[1] years ago related to this defect.\n\nSolution:\n1. Replace xarray with pre-allocated rxe_mr_page array for sequential\n   indexing (all MR page indices are contiguous)\n2. Each rxe_mr_page stores both struct page* and offset within the\n   system page\n3. Handle MR page_size != PAGE_SIZE relationships:\n   - page_size > PAGE_SIZE: Split MR pages into multiple system pages\n   - page_size <= PAGE_SIZE: Store offset within system page\n4. Add boundary checks and compatibility validation\n\nThis ensures correct iova-to-va conversion regardless of MR page size\nand system PAGE_SIZE relationship, while improving performance through\narray-based sequential access.\n\nTests on 4K and 64K PAGE_SIZE hosts:\n- rdma-core/pytests\n  $ ./build/bin/run_tests.py  --dev eth0_rxe\n- blktest:\n  $ TIMEOUT=30 QUICK_RUN=1 USE_RXE=1 NVMET_TRTYPES=rdma ./check nvme srp rnbd\n\n[1] https://lore.kernel.org/all/CAHj4cs9XRqE25jyVw9rj9YugffLn5+f=1znaBEnu1usLOciD+g@mail.gmail.com/T/","published_at":"2026-06-09T12:25:52.792000Z","last_modified_at":null,"cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/409c2c5508f3d30627bea576f8676de523cb906e","https://git.kernel.org/stable/c/836f6c13c9674027793f720be3f15ecd2b90b6ca","https://git.kernel.org/stable/c/12985e5915a0b8354796efadaaeb201eed115377"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:37.146260Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"592627ccbdff0ec6fff00fc761142a76db750dd4","version_start_inclusive":true,"version_end":"409c2c5508f3d30627bea576f8676de523cb906e","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:592627ccbdff0ec6fff00fc761142a76db750dd4:409c2c5508f3d30627bea576f8676de523cb906e"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"592627ccbdff0ec6fff00fc761142a76db750dd4","version_start_inclusive":true,"version_end":"836f6c13c9674027793f720be3f15ecd2b90b6ca","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:592627ccbdff0ec6fff00fc761142a76db750dd4:836f6c13c9674027793f720be3f15ecd2b90b6ca"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"592627ccbdff0ec6fff00fc761142a76db750dd4","version_start_inclusive":true,"version_end":"12985e5915a0b8354796efadaaeb201eed115377","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:592627ccbdff0ec6fff00fc761142a76db750dd4:12985e5915a0b8354796efadaaeb201eed115377"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0e443760b8b7b1e6723f4408afa056b2bc4fea12","version_start_inclusive":true,"version_end":"0e443760b8b7b1e6723f4408afa056b2bc4fea12","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:0e443760b8b7b1e6723f4408afa056b2bc4fea12:0e443760b8b7b1e6723f4408afa056b2bc4fea12"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.2.3","version_start_inclusive":true,"version_end":"6.3","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:6.2.3:6.3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.3","version_start_inclusive":true,"version_end":"6.3","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.3:6.3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.3","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.14","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.14:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.19.4","version_start_inclusive":true,"version_end":"6.19.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.19.4:6.19.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/409c2c5508f3d30627bea576f8676de523cb906e","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/836f6c13c9674027793f720be3f15ecd2b90b6ca","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/12985e5915a0b8354796efadaaeb201eed115377","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-09T12:25:52.792000Z","label":"CVE 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