{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-46325: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-46325","status":"final","version":"1","initial_release_date":"2026-06-09T12:25:52.792Z","current_release_date":"2026-06-14T04:30:21.581Z","revision_history":[{"date":"2026-06-09T12:25:52.792Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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/","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-46325 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-46325"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-46325"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/409c2c5508f3d30627bea576f8676de523cb906e"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/836f6c13c9674027793f720be3f15ecd2b90b6ca"},{"category":"external","summary":"git.kernel.org","url":"https://git.kernel.org/stable/c/12985e5915a0b8354796efadaaeb201eed115377"}]},"product_tree":{"branches":[{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version_range","name":">=592627ccbdff0ec6fff00fc761142a76db750dd4 <409c2c5508f3d30627bea576f8676de523cb906e","product":{"name":"Linux Linux >=592627ccbdff0ec6fff00fc761142a76db750dd4 <409c2c5508f3d30627bea576f8676de523cb906e","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=592627ccbdff0ec6fff00fc761142a76db750dd4 <836f6c13c9674027793f720be3f15ecd2b90b6ca","product":{"name":"Linux Linux >=592627ccbdff0ec6fff00fc761142a76db750dd4 <836f6c13c9674027793f720be3f15ecd2b90b6ca","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=592627ccbdff0ec6fff00fc761142a76db750dd4 <12985e5915a0b8354796efadaaeb201eed115377","product":{"name":"Linux Linux >=592627ccbdff0ec6fff00fc761142a76db750dd4 <12985e5915a0b8354796efadaaeb201eed115377","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"0e443760b8b7b1e6723f4408afa056b2bc4fea12","product":{"name":"Linux Linux 0e443760b8b7b1e6723f4408afa056b2bc4fea12","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=6.2.3 <6.3","product":{"name":"Linux Linux >=6.2.3 <6.3","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Linux","branches":[{"category":"product_name","name":"Linux","branches":[{"category":"product_version","name":"6.3","product":{"name":"Linux Linux 6.3","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.3:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"0","product":{"name":"Linux Linux 0","product_id":"CSAFPID-7","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.3:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.18.14","product":{"name":"Linux Linux 6.18.14","product_id":"CSAFPID-8","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.3:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"6.19.4","product":{"name":"Linux Linux 6.19.4","product_id":"CSAFPID-9","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.3:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"7.0","product":{"name":"Linux Linux 7.0","product_id":"CSAFPID-10","product_identification_helper":{"cpe":"cpe:2.3:a:linux:linux:6.3:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-46325","title":"RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE","notes":[{"category":"description","text":"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/","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"],"fixed":["CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0, 12985e5915a0b8354796efadaaeb201eed115377, 409c2c5508f3d30627bea576f8676de523cb906e, 6.3, 6.18.14, 6.19.4, 7.0, 836f6c13c9674027793f720be3f15ecd2b90b6ca.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"]}]}]}