GHSA-8R55-JH7V-855P

Vulnerability from github – Published: 2026-01-23 18:31 – Updated: 2026-01-23 18:31
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix reference count leak in bpf_prog_test_run_xdp()

syzbot is reporting

unregister_netdevice: waiting for sit0 to become free. Usage count = 2

problem. A debug printk() patch found that a refcount is obtained at xdp_convert_md_to_buff() from bpf_prog_test_run_xdp().

According to commit ec94670fcb3b ("bpf: Support specifying ingress via xdp_md context in BPF_PROG_TEST_RUN"), the refcount obtained by xdp_convert_md_to_buff() will be released by xdp_convert_buff_to_md().

Therefore, we can consider that the error handling path introduced by commit 1c1949982524 ("bpf: introduce frags support to bpf_prog_test_run_xdp()") forgot to call xdp_convert_buff_to_md().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22994"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-23T16:15:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix reference count leak in bpf_prog_test_run_xdp()\n\nsyzbot is reporting\n\n  unregister_netdevice: waiting for sit0 to become free. Usage count = 2\n\nproblem. A debug printk() patch found that a refcount is obtained at\nxdp_convert_md_to_buff() from bpf_prog_test_run_xdp().\n\nAccording to commit ec94670fcb3b (\"bpf: Support specifying ingress via\nxdp_md context in BPF_PROG_TEST_RUN\"), the refcount obtained by\nxdp_convert_md_to_buff() will be released by xdp_convert_buff_to_md().\n\nTherefore, we can consider that the error handling path introduced by\ncommit 1c1949982524 (\"bpf: introduce frags support to\nbpf_prog_test_run_xdp()\") forgot to call xdp_convert_buff_to_md().",
  "id": "GHSA-8r55-jh7v-855p",
  "modified": "2026-01-23T18:31:29Z",
  "published": "2026-01-23T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22994"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/368569bc546d3368ee9980ba79fc42fdff9a3365"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/737be05a765761d7d7c9f7fe92274bd8e6f6951e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98676ee71fd4eafeb8be63c7f3f1905d40e03101"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec69daabe45256f98ac86c651b8ad1b2574489a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb9ef40cccdbacce36029b305d0ef1e12e4fea38"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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