{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-52447",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-52447"
  ],
  "published": "2024-02-22T16:22:12Z",
  "summary": "bpf: Defer the free of inner map when necessary",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Defer the free of inner map when necessary\n\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops->map_free() in a kworker. But for now, most .map_free() callbacks\ndon't use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops->map_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\n\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.1.47-1+rpt4",
        "1:6.1.54-1+rpt2",
        "1:6.1.58-1+rpt2",
        "1:6.1.63-1+rpt1",
        "1:6.1.73-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
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            "binary_version": "1:6.1.21-1+rpt1"
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            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
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            "binary_version": "1:6.1.21-1+rpt1"
          },
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            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi2-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt2"
          },
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            "binary_version": "1:6.1.47-1+rpt2"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-52447"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z"
  }
}