{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31425",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31425"
  ],
  "published": "2026-04-13T13:41:05Z",
  "summary": "rds: ib: reject FRMR registration before IB connection is established",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: reject FRMR registration before IB connection is established\n\nrds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data\nand passes it to rds_ib_reg_frmr() for FRWR memory registration. On a\nfresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with\ni_cm_id = NULL because the connection worker has not yet called\nrds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with\nRDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses\nthe control message before any connection establishment, allowing\nrds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the\nkernel.\n\nThe existing guard in rds_ib_reg_frmr() only checks for !ic (added in\ncommit 9e630bcb7701), which does not catch this case since ic is allocated\nearly and is always non-NULL once the connection object exists.\n\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:rds_ib_post_reg_frmr+0x50e/0x920\n Call Trace:\n  rds_ib_post_reg_frmr (net/rds/ib_frmr.c:167)\n  rds_ib_map_frmr (net/rds/ib_frmr.c:252)\n  rds_ib_reg_frmr (net/rds/ib_frmr.c:430)\n  rds_ib_get_mr (net/rds/ib_rdma.c:615)\n  __rds_rdma_map (net/rds/rdma.c:295)\n  rds_cmsg_rdma_map (net/rds/rdma.c:860)\n  rds_sendmsg (net/rds/send.c:1363)\n  ____sys_sendmsg\n  do_syscall_64\n\nAdd a check in rds_ib_get_mr() that verifies ic, i_cm_id, and qp are all\nnon-NULL before proceeding with FRMR registration, mirroring the guard\nalready present in rds_ib_post_inv(). Return -ENODEV when the connection\nis not ready, which the existing error handling in rds_cmsg_send() converts\nto -EAGAIN for userspace retry and triggers rds_conn_connect_if_down() to\nstart the connection worker.",
  "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": "6.1.168",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31425"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c506456ebf84c50ed9327473d4e9bd905def212b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/82e4a3b56b23b844802056c9e75a39d24169b0a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/450ec93c0f172374acbf236f1f5f02d53650aa2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6b0a8de67ac0c74e1a7df92b73c862cb36780dfc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a5bfd14c9a299e6db4add4440430ee5e010b03ad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/23e07c340c445f0ebff7757ba15434cb447eb662"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/47de5b73db3b88f45c107393f26aeba26e9e8fae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a54ecccfae62c5c85259ae5ea5d9c20009519049"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}