{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53566",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53566"
  ],
  "published": "2025-10-04T15:17:41Z",
  "summary": "netfilter: nft_set_rbtree: fix null deref on element insertion",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_rbtree: fix null deref on element insertion\n\nThere is no guarantee that rb_prev() will not return NULL in nft_rbtree_gc_elem():\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]\n nft_add_set_elem+0x14b0/0x2990\n  nf_tables_newsetelem+0x528/0xb30\n\nFurthermore, there is a possible use-after-free while iterating,\n'node' can be free'd so we need to cache the next value to use.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.30"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53566"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z"
  }
}