ghsa-www3-7cx8-9832
Vulnerability from github
Published
2025-12-30 15:30
Modified
2025-12-30 15:30
Details

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

bpf: prevent leak of lsm program after failed attach

In [0], we added the ability to bpf_prog_attach LSM programs to cgroups, but in our validation to make sure the prog is meant to be attached to BPF_LSM_CGROUP, we return too early if the check fails. This results in lack of decrementing prog's refcnt (through bpf_prog_put) leaving the LSM program alive past the point of the expected lifecycle. This fix allows for the decrement to take place.

[0] https://lore.kernel.org/all/20220628174314.1216643-4-sdf@google.com/

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50855"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-30T13:16:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: prevent leak of lsm program after failed attach\n\nIn [0], we added the ability to bpf_prog_attach LSM programs to cgroups,\nbut in our validation to make sure the prog is meant to be attached to\nBPF_LSM_CGROUP, we return too early if the check fails. This results in\nlack of decrementing prog\u0027s refcnt (through bpf_prog_put)\nleaving the LSM program alive past the point of the expected lifecycle.\nThis fix allows for the decrement to take place.\n\n[0] https://lore.kernel.org/all/20220628174314.1216643-4-sdf@google.com/",
  "id": "GHSA-www3-7cx8-9832",
  "modified": "2025-12-30T15:30:28Z",
  "published": "2025-12-30T15:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50855"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a1504dd36cd9a0a69250d61da8bdb17b29f1fe8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82b39df5ddb298daaf6dc504032ff7eb027fa106"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e89f3edffb860a0f54a9ed16deadb7a4a1fa3862"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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