bpf, x86: fix freeing of not-finalized bpf_prog_pack

{
  "id": "f291a3908755a52c4144c172c8284a9500cfb4c9ce721ee357bfa4ffa41ff9d6",
  "url": "https://osv.dev/vulnerability/CVE-2022-50168",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf, x86: fix freeing of not-finalized bpf_prog_pack",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf, x86: fix freeing of not-finalized bpf_prog_pack syzbot reported a few issues with bpf_prog_pack [1], [2]. This only happens with multiple subprogs. In jit_subprogs(), we first call bpf_int_jit_compile() on each sub program. And then, we call it on each sub program again. jit_data is not freed in the first call of bpf_int_jit_compile(). Similarly we don't call bpf_jit_binary_pack_finalize() in the first call of bpf_int_jit_compile(). If bpf_int_jit_compile() failed for one sub program, we will call bpf_jit_binary_pack_finalize() for this sub program. However, we don't have a chance to call it for other sub programs. Then we will hit \"goto out_free\" in jit_subprogs(), and call bpf_jit_free on some subprograms that haven't got bpf_jit_binary_pack_finalize() yet. At this point, bpf_jit_binary_pack_free() is called and the whole 2MB page is freed erroneously. Fix this with a custom bpf_jit_free() for x86_64, which calls bpf_jit_binary_pack_finalize() if necessary. Also, with custom bpf_jit_free(), bpf_prog_aux->use_bpf_prog_pack is not needed any more, remove it. [1] https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f [2] https://syzkaller.appspot.com/bug?extid=87f65c75f4a72db05445",
    "evidence": "osv:CVE-2022-50168",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.18.18",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.19.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-50168",
      "aliases": [
        "CVE-2022-50168"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "1022a5498f6f745c3b5fd3f050a5e11e7ca354f0"
                },
                {
                  "fixed": "f91ce608a79c0db3e72bd63c23e011a9ebc31505"
                },
                {
                  "fixed": "60e66074812dde9cde3d99cdd3caa9e40f1a4516"
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                {
                  "fixed": "1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d"
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          "database_specific": {
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.18.0"
                },
                {
                  "fixed": "5.18.18"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
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                {
                  "fixed": "5.19.2"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50168.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.522507090Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d",
        "https://git.kernel.org/stable/c/60e66074812dde9cde3d99cdd3caa9e40f1a4516",
        "https://git.kernel.org/stable/c/f91ce608a79c0db3e72bd63c23e011a9ebc31505",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50168.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50168",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50168.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50168",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495032,
  "published_at": "2025-06-18T11:03:21.593+00:00"
}