{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46053",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46053"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "net: rds: fix MR cleanup on copy error",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rds: fix MR cleanup on copy error\n\n__rds_rdma_map() hands sg/pages ownership to the transport after\nget_mr() succeeds. If copying the generated cookie back to user space\nfails after that point, the error path must not free those resources\nagain before dropping the MR reference.\n\nRemove the duplicate unpin/free from the put_user() failure branch so\nthat MR teardown is handled only through the existing final cleanup\npath.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/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": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46053"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/91a44b406bc1f9e1c5da0cb7d0d5991b43b79147"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/106dc689206610cfa2098f593fdd1e020c997835"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec55a86f7fba7d9111df94b9c11a4755ed492995"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8fdbb6262a4a3ed44a0830a7793903b54bb27bdc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d95cea9298be1ba8876e3f156be96d3a492085ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/033370ffb3c9c0264d19f8ba9ef769523266589a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b3cb8cae530b2727d8245684148bb49425f6765c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8141a2dc70080eda1aedc0389ed2db2b292af5bd"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is triggered through the local `setsockopt(SOL_RDS, RDS_GET_MR/RDS_GET_MR_FOR_DEST)` syscall on an RDS socket (MR-registration control plane); it is not reachable from a remote peer's network packets.\nAC:L - Once an RDMA-capable RDS socket is bound, the double-free is 100% deterministic and the attacker fully controls the trigger by supplying a bad `cookie_addr` so `put_user()` faults; there is no race or attacker-uncontrolled condition.\nPR:L - Creating an AF_RDS socket has no capability check (module auto-loads) and `can_do_mlock()` passes for normal users by default, so any unprivileged local user on a host with RDMA hardware can reach the path.\nUI:N - The attacker triggers the entire sequence with its own syscalls; no action by another user or victim is required.\nS:U - The double-free corrupts the kernel slab/page allocator within the kernel's own security authority and does not cross a virtualization or IOMMU boundary.\nC:H - The double-free of the `sg` slab object and the page-refcount underflow yield use-after-free/cross-object primitives that can be groomed into arbitrary kernel-memory reads, enabling significant information disclosure.\nI:H - A double `kfree()` corrupts the SLUB freelist and the page-refcount underflow allows reuse of an in-use physical page, both classic primitives for arbitrary kernel write and privilege escalation.\nA:H - The double-free and page-refcount underflow readily cause heap corruption, freelist poisoning, and kernel panic/oops."
    }
  }
}