CVE-2026-46325 (GCVE-0-2026-46325)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:25 – Updated: 2026-08-05 12:31
VLAI
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 - Resulting VA: system page of 0x170000 + 0x10 = 0x170010 (wrong) Yi Zhang reported a kernel panic[1] years ago related to this defect. Solution: 1. Replace xarray with pre-allocated rxe_mr_page array for sequential indexing (all MR page indices are contiguous) 2. Each rxe_mr_page stores both struct page* and offset within the system page 3. Handle MR page_size != PAGE_SIZE relationships: - page_size > PAGE_SIZE: Split MR pages into multiple system pages - page_size <= PAGE_SIZE: Store offset within system page 4. Add boundary checks and compatibility validation This ensures correct iova-to-va conversion regardless of MR page size and system PAGE_SIZE relationship, while improving performance through array-based sequential access. Tests on 4K and 64K PAGE_SIZE hosts: - rdma-core/pytests $ ./build/bin/run_tests.py --dev eth0_rxe - blktest: $ TIMEOUT=30 QUICK_RUN=1 USE_RXE=1 NVMET_TRTYPES=rdma ./check nvme srp rnbd [1] https://lore.kernel.org/all/CAHj4cs9XRqE25jyVw9rj9YugffLn5+f=1znaBEnu1usLOciD+g@mail.gmail.com/T/
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 592627ccbdff0ec6fff00fc761142a76db750dd4 , < 409c2c5508f3d30627bea576f8676de523cb906e (git)
Affected: 592627ccbdff0ec6fff00fc761142a76db750dd4 , < 836f6c13c9674027793f720be3f15ecd2b90b6ca (git)
Affected: 592627ccbdff0ec6fff00fc761142a76db750dd4 , < 12985e5915a0b8354796efadaaeb201eed115377 (git)
Affected: 0e443760b8b7b1e6723f4408afa056b2bc4fea12 (git)
Affected: 6.2.3 , < 6.3 (semver)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "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-\u003epage_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\u003e=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-\u003epage_size aligned.\n\nThis leads to incorrect iova-to-va conversion in scenarios:\n\n1) page_size \u003c PAGE_SIZE (e.g., MR: 4K, system: 64K):\n   ibmr-\u003eiova = 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 \u003e\u003e 12) - (0x181800 \u003e\u003e 12) = 1\n     - page_offset = 0x182010 \u0026 0xFFF = 0x10\n     - xarray[1] stores system page base 0x170000\n     - Resulting VA: 0x170000 + 0x10 = 0x170010 (wrong)\n\n2) page_size \u003e PAGE_SIZE (e.g., MR: 64K, system: 4K):\n   ibmr-\u003eiova = 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 \u003e\u003e 16) - (0x18f800 \u003e\u003e 16) = 1\n     - page_offset = 0x190010 \u0026 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 \u003e PAGE_SIZE: Split MR pages into multiple system pages\n   - page_size \u003c= 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/"
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            "value": "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-\u003epage_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\u003e=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-\u003epage_size aligned.\n\nThis leads to incorrect iova-to-va conversion in scenarios:\n\n1) page_size \u003c PAGE_SIZE (e.g., MR: 4K, system: 64K):\n   ibmr-\u003eiova = 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 \u003e\u003e 12) - (0x181800 \u003e\u003e 12) = 1\n     - page_offset = 0x182010 \u0026 0xFFF = 0x10\n     - xarray[1] stores system page base 0x170000\n     - Resulting VA: 0x170000 + 0x10 = 0x170010 (wrong)\n\n2) page_size \u003e PAGE_SIZE (e.g., MR: 64K, system: 4K):\n   ibmr-\u003eiova = 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 \u003e\u003e 16) - (0x18f800 \u003e\u003e 16) = 1\n     - page_offset = 0x190010 \u0026 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 \u003e PAGE_SIZE: Split MR pages into multiple system pages\n   - page_size \u003c= 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/"
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          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRDMA/rxe: Correcci\u00f3n de la conversi\u00f3n iova-a-va para tama\u00f1os de p\u00e1gina de MR != PAGE_SIZE\n\nLa implementaci\u00f3n actual maneja incorrectamente las regiones de memoria (MRs) con tama\u00f1os de p\u00e1gina diferentes al PAGE_SIZE del sistema. El problema central es que rxe_set_page() se llama con incrementos de paso mr-\u003epage_size, pero la page_list almacena punteros individuales a struct page, cada uno representando PAGE_SIZE de memoria.\n\nib_sg_to_page() ha asegurado que cuando i\u003e=1, o bien a) SG[i-1].dma_end y SG[i].dma_addr son contiguos o b) SG[i-1].dma_end y SG[i].dma_addr est\u00e1n alineados con mr-\u003epage_size.\n\nEsto lleva a una conversi\u00f3n iova-a-va incorrecta en los siguientes escenarios:\n\n1) page_size \u003c PAGE_SIZE (ej., MR: 4K, sistema: 64K):\n   ibmr-\u003eiova = 0x181800\n   sg[0]: dma_addr=0x181800, len=0x800\n   sg[1]: dma_addr=0x173000, len=0x1000\n\n   Acceso iova = 0x181800 + 0x810 = 0x182010\n   VA esperada: 0x173010 (segundo SG, desplazamiento 0x10)\n   Antes de la correcci\u00f3n:\n     - \u00edndice = (0x182010 \u003e\u003e 12) - (0x181800 \u003e\u003e 12) = 1\n     - page_offset = 0x182010 \u0026 0xFFF = 0x10\n     - xarray[1] almacena la base de p\u00e1gina del sistema 0x170000\n     - VA resultante: 0x170000 + 0x10 = 0x170010 (incorrecto)\n\n2) page_size \u003e PAGE_SIZE (ej., MR: 64K, sistema: 4K):\n   ibmr-\u003eiova = 0x18f800\n   sg[0]: dma_addr=0x18f800, len=0x800\n   sg[1]: dma_addr=0x170000, len=0x1000\n\n   Acceso iova = 0x18f800 + 0x810 = 0x190010\n   VA esperada: 0x170010 (segundo SG, desplazamiento 0x10)\n   Antes de la correcci\u00f3n:\n     - \u00edndice = (0x190010 \u003e\u003e 16) - (0x18f800 \u003e\u003e 16) = 1\n     - page_offset = 0x190010 \u0026 0xFFFF = 0x10\n     - xarray[1] almacena la p\u00e1gina del sistema para dma_addr 0x170000\n     - VA resultante: p\u00e1gina del sistema de 0x170000 + 0x10 = 0x170010 (incorrecto)\n\nYi Zhang inform\u00f3 de un kernel panic[1] hace a\u00f1os relacionado con este defecto.\n\nSoluci\u00f3n:\n1. Reemplazar xarray con un array rxe_mr_page preasignado para indexaci\u00f3n secuencial (todos los \u00edndices de p\u00e1gina de MR son contiguos)\n2. Cada rxe_mr_page almacena tanto struct page como el desplazamiento dentro de la p\u00e1gina del sistema\n3. Manejar las relaciones MR page_size != PAGE_SIZE:\n   - page_size \u003e PAGE_SIZE: Dividir las p\u00e1ginas de MR en m\u00faltiples p\u00e1ginas del sistema\n   - page_size \u003c= PAGE_SIZE: Almacenar el desplazamiento dentro de la p\u00e1gina del sistema\n4. A\u00f1adir comprobaciones de l\u00edmites y validaci\u00f3n de compatibilidad\n\nEsto asegura una conversi\u00f3n iova-a-va correcta independientemente del tama\u00f1o de p\u00e1gina de MR y la relaci\u00f3n PAGE_SIZE del sistema, al tiempo que mejora el rendimiento mediante el acceso secuencial basado en arrays.\n\nPruebas en hosts con PAGE_SIZE de 4K y 64K:\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/"
          }
        ],
        "id": "CVE-2026-46325",
        "lastModified": "2026-07-23T08:10:00.137",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-06-09T14:16:42.177",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/12985e5915a0b8354796efadaaeb201eed115377"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/409c2c5508f3d30627bea576f8676de523cb906e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/836f6c13c9674027793f720be3f15ecd2b90b6ca"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:40:55+00:00",
      "cve": "CVE-2026-46325",
      "id": "CVE-2026-46325",
      "initial_release_date": "2026-06-09T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46325.json",
      "version": "3"
    }
  }
}



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