RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE

{
  "id": "61f0c3cf6eb0e27abb6b46f9075d4c83a316f349cb313e0b6bed96374f48916a",
  "url": "https://osv.dev/vulnerability/CVE-2026-46325",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE The current implementation incorrectly handles memory regions (MRs) with page sizes different from the system PAGE_SIZE. The core issue is that rxe_set_page() is called with mr->page_size step increments, but the page_list stores individual struct page pointers, each representing PAGE_SIZE of memory. ib_sg_to_page() has ensured that when i>=1 either a) SG[i-1].dma_end and SG[i].dma_addr are contiguous or b) SG[i-1].dma_end and SG[i].dma_addr are mr->page_size aligned. This leads to incorrect iova-to-va conversion in scenarios: 1) page_size < PAGE_SIZE (e.g., MR: 4K, system: 64K): ibmr->iova = 0x181800 sg[0]: dma_addr=0x181800, len=0x800 sg[1]: dma_addr=0x173000, len=0x1000 Access iova = 0x181800 + 0x810 = 0x182010 Expected VA: 0x173010 (second SG, offset 0x10) Before fix: - index = (0x182010 >> 12) - (0x181800 >> 12) = 1 - page_offset = 0x182010 & 0xFFF = 0x10 - xarray[1] stores system page base 0x170000 - Resulting VA: 0x170000 + 0x10 = 0x170010 (wrong) 2) page_size > PAGE_SIZE (e.g., MR: 64K, system: 4K): ibmr->iova = 0x18f800 sg[0]: dma_addr=0x18f800, len=0x800 sg[1]: dma_addr=0x170000, len=0x1000 Access iova = 0x18f800 + 0x810 = 0x190010 Expected VA: 0x170010 (second SG, offset 0x10) Before fix: - index = (0x190010 >> 16) - (0x18f800 >> 16) = 1 - page_offset = 0x190010 & 0xFFFF = 0x10 - xarray[1] stores system page for dma_addr 0x170000 - ",
    "evidence": "osv:CVE-2026-46325",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.14",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-46325",
      "aliases": [
        "CVE-2026-46325"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "592627ccbdff0ec6fff00fc761142a76db750dd4"
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                {
                  "fixed": "e327021bd73b134c18167e2cd2a52eb5597fcba6"
                },
                {
                  "fixed": "2a585a08a43c568ed6e9f27a97fd3d95106b9e68"
                },
                {
                  "fixed": "409c2c5508f3d30627bea576f8676de523cb906e"
                },
                {
                  "fixed": "836f6c13c9674027793f720be3f15ecd2b90b6ca"
                },
                {
                  "fixed": "12985e5915a0b8354796efadaaeb201eed115377"
                }
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            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "6.2.3"
                },
                {
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            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0e443760b8b7b1e6723f4408afa056b2bc4fea12"
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          "versions": [
            "v6.2.16",
            "v6.2.15",
            "v6.2.14",
            "v6.2.13",
            "v6.2.12",
            "v6.2.11",
            "v6.2.10",
            "v6.2.9",
            "v6.2.8",
            "v6.2.7",
            "v6.2.6",
            "v6.2.5",
            "v6.2.4",
            "v6.2.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46325.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.114"
                }
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                },
                {
                  "fixed": "6.18.14"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46325.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.016789501Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/12985e5915a0b8354796efadaaeb201eed115377",
        "https://git.kernel.org/stable/c/2a585a08a43c568ed6e9f27a97fd3d95106b9e68",
        "https://git.kernel.org/stable/c/409c2c5508f3d30627bea576f8676de523cb906e",
        "https://git.kernel.org/stable/c/836f6c13c9674027793f720be3f15ecd2b90b6ca",
        "https://git.kernel.org/stable/c/e327021bd73b134c18167e2cd2a52eb5597fcba6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46325.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46325",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46325.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46325",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498199,
  "published_at": "2026-06-09T12:25:52.792+00:00"
}