{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98365",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98365"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access\n\nmr_check_range() validates that [iova, iova+length) falls within the\nregistered MR range using wraparound-prone arithmetic:\n\n    if (iova < mr->ibmr.iova ||\n        iova + length > mr->ibmr.iova + mr->ibmr.length)\n\nA remote peer can craft an RDMA-Write/Read RETH so that iova + length\nwraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the\ncheck. rxe_mr_iova_to_index() then computes a huge index (int idx, only\nguarded by WARN_ON) and rxe_mr_copy_xarray() dereferences\nmr->page_info[huge], causing an out-of-bounds read/write and a kernel\noops that is triggerable by an unauthenticated remote peer.\n\nRewrite the check in overflow-safe form; the first two clauses guarantee\nthat the subsequent subtractions do not underflow:\n\n    if (iova < mr->ibmr.iova ||\n        length > mr->ibmr.length ||\n        iova - mr->ibmr.iova > mr->ibmr.length - length)\n\nWith the fix, mr_check_range() returns -EINVAL for the crafted iova and\nthe responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98365"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b7d2118660545a00b21e83010ded1a231c6fb8c5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d9426a74fc8cb8f375fcdc19b465a030f9b8cab"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f3b705144e3a3c14184fec6e354680081fe91ec"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3431f525718f6b07da308cda6d44f8cb548bbd37"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d10e2a08799e858d3e71ea4169bcd018f216d444"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bad iova and length come from the RETH header of a RoCEv2 RDMA WRITE/READ (UDP/IP, routable). qp_resp_from_reth() copies them into qp->resp, and check_rkey() hands them to mr_check_range(), where iova+length wraps past 2^64 and the bounds check passes.\nAC:L - The attacker is the connected RC peer, so it controls the QPN, PSN and RETH contents and chooses va near 2^64 to make iova+length wrap for any MR. The bug fires on the first packet, with no race or memory layout to win.\nPR:N - RoCE has no authentication. check_addr() only matches the peer's IP address, and services such as rtrs-srv send MR rkeys with IB_ACCESS_REMOTE_WRITE to any client that connects, without checking credentials.\nUI:N - No victim action is needed. The responder processes the attacker's RETH request entirely in kernel receive context once the QP is connected.\nS:U - The out-of-bounds access corrupts or discloses kernel memory on the same host, inside the kernel's own security authority. No VM or IOMMU boundary is crossed.\nC:H - For RDMA READ, rxe_mr_copy_xarray() memcpy()s from a struct page pointer read out of bounds of mr->page_info[], and that data is sent back to the remote peer. Choosing va moves the index over a window of about 2^20 entries.\nI:H - For RDMA WRITE, rxe_mr_copy_xarray() memcpy()s the peer's payload into the page pointed to by the out-of-bounds page_info[idx].page entry. That is a remote write into kernel-chosen memory, which can be used to hijack control flow.\nA:H - An out-of-bounds page_info index, past the WARN_ON in rxe_mr_iova_to_index(), dereferences garbage page pointers and oopses the kernel. A remote peer can repeat this at will."
    }
  }
}