{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74394",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74394"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "RDMA/srpt: fix integer overflow in immediate data length check",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/srpt: fix integer overflow in immediate data length check\n\nimm_buf->len is a user-controlled uint32_t received from the network.\nAdding it to imm_data_offset without overflow checking allows a\nmalicious initiator to send len=0xFFFFFFFF, causing req_size to wrap\naround to a small value, bypassing the bounds check, and subsequently\npassing a ~4GB length to sg_init_one().\n\nUse check_add_overflow() to detect wrapping before the comparison.",
  "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": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74394"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c82c860f8c8e4f4f454c9f14d0ad0c0466965f7d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3efa5301137140a3ca3677a9098c0a93a0acfd49"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/067b9556eeb007f28b7c2033b4dcde5b6d88418f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dcf7a986f377cce0749ed53f1d64195fbd5fdf91"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/07dec3f6dcb6c6cc891162d252b800eb0e6d5e8e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/65572fbd86033ae2370125593d59b8be34253aaf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72497172a4799119a0282a5eb5e2b8ddcc821921"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb4ecdf631fe00e8020bf461503cb9b7017ed796"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - SRPT is an in-kernel SCSI RDMA target reached by remote initiators over InfiniBand/RoCE via RDMA/IB CM; malicious SRP_CMD IUs are delivered through `srpt_recv_done()` without any local syscall or physical access.\nAC:L - Once connected on an immediate-data SRPT target (use_srq=0), a malicious initiator deterministically sets `imm_buf->len=0xFFFFFFFF` to wrap `req_size` and bypass checks; no race or attacker-uncontrollable condition is required.\nPR:N - SRPT enables LIO demo mode (`srpt_check_true`), so any remote initiator that completes SRP login on an enabled target gets a dynamic ACL without target-local credentials, root, or CAP_NET_ADMIN on the victim host.\nUI:N - Exploitation requires only attacker-initiated RDMA connection, SRP login, and crafted SRP_CMD traffic; no administrator or other user must mount storage or perform any action on the target.\nS:U - The integer overflow corrupts kernel heap memory and SCSI-target processing within the host kernel's own security authority; it does not cross VM, IOMMU, or container sandbox boundaries.\nC:H - Passing a ~4GB length to `sg_init_one()` on a small receive buffer creates a massive out-of-bounds scatterlist; subsequent target-core DMA/map operations can read far beyond the buffer, enabling arbitrary kernel memory disclosure.\nI:H - The bogus scatterlist gives the block/SCSI target path an attacker-controlled ~4GB kernel memory write/read primitive over adjacent heap objects, exploitable for control-flow hijacking and privilege escalation.\nA:H - Out-of-bounds access from a ~4GB scatterlist on a kilobyte-scale receive buffer readily triggers kernel oops, KASAN faults, or panic, denying availability even before full exploitation."
    }
  }
}