{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53077",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53077"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "net/rds: Restrict use of RDS/IB to the initial network namespace",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: Restrict use of RDS/IB to the initial network namespace\n\nPrevent using RDS/IB in network namespaces other than the initial one.\nThe existing RDS/IB code will not work properly in non-initial network\nnamespaces.",
  "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-2026-53077"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3e7f14cd5a51533404e1ae4809caab46073fb5c7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3174fc703d081d2ca538b22fba734e3ad5b52322"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c244b79adffad89a5173cf8bfaa06a6b40bbd09b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/07035306bf722f4676a1aee35cbeb3732c76194e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb407343c0c16e94584707b2dfdd350a5f81b000"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a7494479757d60d2413bfaa087f8431a26eea032"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6a54f5e9ce9b97ae641855378d71c5154a085c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ebf71dd4aff46e8e421d455db3e231ba43d2fa8a"
    }
  ],
  "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 - Reachability is through local syscalls: unshare a user/network namespace, create an AF_RDS socket, select RDS/IB with setsockopt, then bind/send and tear down the namespace. A remote peer alone cannot create the stale non-init namespace RDS/IB connection.\nAC:L - The attacker controls the namespace lifetime and socket operations needed to leave an RDS/IB connection with a stale net pointer, and syzbot reproduced the UAF. No hard-to-win race or victim state outside attacker control is required.\nPR:L - AF_RDS socket creation and SO_RDS_TRANSPORT do not require real init-namespace root, and the issue is reachable by an unprivileged local user via user namespaces. This is not an unauthenticated remote path, so low local privileges are required.\nUI:N - No victim action is needed after the attacker runs the local namespace and socket sequence. The later RDMA/RDS workqueue access occurs asynchronously in kernel context.\nS:U - The vulnerability corrupts/accesses kernel resources within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-authority boundary break.\nC:H - The bug is a slab use-after-free read of a freed net_namespace from RDS/IB asynchronous connection handling. Under the required kernel scoring guidance, UAFs are scored as high confidentiality impact because freed object reuse can expose kernel memory.\nI:H - Although the observed report is a UAF read, use-after-free bugs can generally be shaped through heap reuse into stronger memory corruption primitives. Per the required guidance and uncertainty rule, this warrants high integrity impact.\nA:H - Syzbot reports a KASAN slab-use-after-free in rds_conn_path_drop, and the same stale pointer access can trigger kernel oops/panic or destabilize RDS/RDMA workqueues. Kernel crash availability impact is high."
    }
  }
}