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

Type: advisorySource: Official CVE List1 source record

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 -

Announced Source revision 1
Original source ↗

CVE-2026-46325

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46325

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "592627ccbdff0ec6fff00fc761142a76db750dd4",
        "lessThan": "e327021bd73b134c18167e2cd2a52eb5597fcba6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "592627ccbdff0ec6fff00fc761142a76db750dd4",
        "lessThan": "2a585a08a43c568ed6e9f27a97fd3d95106b9e68",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "592627ccbdff0ec6fff00fc761142a76db750dd4",
        "lessThan": "409c2c5508f3d30627bea576f8676de523cb906e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "592627ccbdff0ec6fff00fc761142a76db750dd4",
        "lessThan": "836f6c13c9674027793f720be3f15ecd2b90b6ca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "592627ccbdff0ec6fff00fc761142a76db750dd4",
        "lessThan": "12985e5915a0b8354796efadaaeb201eed115377",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0e443760b8b7b1e6723f4408afa056b2bc4fea12",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.2.3",
        "lessThan": "6.3",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_mr.c",
      "drivers/infiniband/sw/rxe/rxe_verbs.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_mr.c",
      "drivers/infiniband/sw/rxe/rxe_verbs.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46325

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#46342 · Revision 1
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Publisher date
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