{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53221",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53221"
  ],
  "published": "2025-09-15T14:26:11Z",
  "summary": "bpf: Fix memleak due to fentry attach failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memleak due to fentry attach failure\n\nIf it fails to attach fentry, the allocated bpf trampoline image will be\nleft in the system. That can be verified by checking /proc/kallsyms.\n\nThis meamleak can be verified by a simple bpf program as follows:\n\n  SEC(\"fentry/trap_init\")\n  int fentry_run()\n  {\n      return 0;\n  }\n\nIt will fail to attach trap_init because this function is freed after\nkernel init, and then we can find the trampoline image is left in the\nsystem by checking /proc/kallsyms.\n\n  $ tail /proc/kallsyms\n  ffffffffc0613000 t bpf_trampoline_6442453466_1  [bpf]\n  ffffffffc06c3000 t bpf_trampoline_6442453466_1  [bpf]\n\n  $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \"FUNC 'trap_init'\"\n  [2522] FUNC 'trap_init' type_id=119 linkage=static\n\n  $ echo $((6442453466 & 0x7fffffff))\n  2522\n\nNote that there are two left bpf trampoline images, that is because the\nlibbpf will fallback to raw tracepoint if -EINVAL is returned.",
  "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-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": "6.1.39"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53221"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20109ddd5bea2c24d790debf5d02584ef24c3f5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f72c67d1a82dada7d6d504c806e111e913721a30"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6aa27775db63ba8c7c73891c7dfb71ddc230c48d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/108598c39eefbedc9882273ac0df96127a629220"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-24T06:48:58Z"
  }
}