{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-97413",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-97413"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "RDMA/rtrs-srv: Fix integer underflow in process_read and process_write",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rtrs-srv: Fix integer underflow in process_read and process_write\n\nusr_len is read from a network-supplied message field (le16_to_cpu)\nand used to compute data_len = off - usr_len without validating that\nusr_len <= off. A malicious RDMA client can send usr_len > off causing\nan integer underflow, resulting in data_len wrapping to a huge size_t\nvalue which is then passed to the rdma_ev callback as a memory length,\nleading to out-of-bounds memory access.\n\nFix by reading and validating usr_len <= off before rtrs_srv_get_ops_ids()\nin both process_read() and process_write(), ensuring the early return\npath acquires no reference and has no resource leak.",
  "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": "6.1.189",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-97413"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6b1e26e70d7ca9f0906af2283558a530eeb1f066"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2c52b2afded988233cd4ccc185cf5147bbc77a76"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b042b4947752df0b3d16e683ac09fb4f7f0e33e0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/24ad03bfeda05fca04c56677e57fd3d6bc3e9978"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c76e9123ab91a903396d26e6ab1b5caae5c6b149"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - A remote peer RDMA-WRITE-WITH-IMM's a RTRS_MSG_READ or RTRS_MSG_WRITE carrying attacker-controlled usr_len; rtrs_srv_rdma_done() hands that buffer to process_io_req() then process_read()/process_write(). rtrs_srv_cm_init() listens with RDMA_PS_TCP on IPv6 port 1234 (RoCEv2/iWARP), which is IP-routable.\nAC:L - The peer sets le16 usr_len in the RTRS_MSG_READ/WRITE at chunk+off and the IMM payload that rtrs_srv_rdma_done() splits into msg_id and off. Choosing usr_len > off makes size_t data_len = off - usr_len wrap on every call; there is no race and no victim-held state.\nPR:N - rtrs_rdma_connect() admits the RDMA_CM CONNECT_REQUEST after checking only RTRS_MAGIC, protocol major version, and cid/uuid; process_info_req() then publishes chunk rkeys and moves to RTRS_SRV_CONNECTED with no credentials, so process_read()/process_write() run unauthenticated.\nUI:N - The attacker posts the RDMA-WRITE-WITH-IMM that rtrs_srv_rdma_done() delivers to process_read()/process_write(); no local user must mount a volume, open a file, or otherwise interact.\nS:U - process_read()/process_write() invoke rnbd_srv_rdma_ev() in the same host kernel that owns the chunk pages; the OOB access stays inside that kernel and does not escape a VM, guest, or IOMMU domain.\nC:H - Underflowed data_len makes usr = page_address(chunk)+off-usr_len point before the chunk. rnbd_srv_rdma_ev() reads the RNBD header there; a sprayed RNBD_MSG_OPEN does unbounded strlen(dev_name), and process_rdma() bio_add_virt_nofail()s a ~4GiB WRITE bvec that copies following linear-map pages onto a device the peer can read back.\nI:H - process_rdma() truncates the wrapped size_t to u32 and bio_add_virt_nofail() installs a ~4GiB bvec from the chunk page; submit_bio() of an RNBD_OP_READ therefore writes device data through that bvec into subsequent kernel linear-map pages, an out-of-bounds kernel write.\nA:H - rnbd_srv_rdma_ev() immediately loads hdr->type from the wrapped usr pointer, process_msg_open() strlen()s that OOB name, and the ~4GiB bio_add_virt_nofail() bvec walks into holes or MMIO in the linear map; any of those oops/panic the completion path and can be repeated at will."
    }
  }
}