{
  "cveId": "CVE-2026-64269",
  "url": "https://patchblox.com/security/cve/CVE-2026-64269",
  "summary": "CVE-2026-64269 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2026-64269, released July 26, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg  When the server answers an RTRS READ, rdma_write_sg() builds the source scatter/gather entry for the IB_WR_RDMA_WRITE that returns data to the peer. Its length is taken directly from the wire descriptor:    plist-\u003Elength = le32_to_cpu(id-\u003Erd_msg-\u003Edesc[0].len);  rd_msg points into the chunk buffer that the remote peer filled via RDMA-WRITE-WITH-IMM (rtrs_srv_rdma_done() -\u003E process_io_req() -\u003E process_read()), so desc[0].len is attacker-controlled and, before this change, was only rejected when zero. The source address is the fixed chunk start (dma_addr[msg_id]) and the source lkey is the PD-wide local_dma_lkey, which is not tied to the chunk\u0027s MR mapping, so the verbs layer does not constrain the transfer length to max_chunk_size. msg_id and off are bounded against queue_depth and max_chunk_size in rtrs_srv_rdma_done(), but desc[0].len is a separate field that was not checked against the chunk size.  A peer that advertises desc[0].len larger than max_chunk_size can make the posted RDMA write read past the chunk\u0027s mapped region. The resulting behaviour depends on the IOMMU configuration: with no IOMMU or in passthrough mode the read may extend into memory adjacent to the chunk and be returned to the peer, which can disclose host memory; with a translating IOMMU the out-of-range access is expected to fault and abort the connection. In either case the transfer exceeds what the protocol permits and is driven by a remote peer.  Reject a descriptor length above max_chunk_size, mirroring the existing off \u003E= max_chunk_size bound in rtrs_srv_rdma_done(). Legitimate clients do not exceed it: the client sets desc[0].len to its MR length, which is capped at the negotiated max_io_size (max_chunk_size - MAX_HDR_SIZE).",
  "published": "2026-07-25T10:17:07Z",
  "severity": "Moderate",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00714,
  "epssPercentile": 0.53934,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64269",
  "fixes": [
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      "platform": "linux",
      "product": "dtb-aarch64",
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      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.81.1",
      "fix": "SUSE-SU-2026:4254-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4254-1",
      "released": "2026-10-07T22:31:36Z"
    },
    {
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      "product": "kernel-64kb",
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      "fixedVersion": "6.12.0-160000.38.1",
      "fix": "SUSE-SU-2026:23902-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23902-1",
      "released": "2026-09-22T14:23:31Z"
    },
    {
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      "product": "kernel-azure",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T15:26:20Z"
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  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}