ghsa-33f2-r445-jvq6
Vulnerability from github
Published
2022-05-24 17:16
Modified
2022-05-24 17:16
Details

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.

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{
  "affected": [],
  "aliases": [
    "CVE-2019-15794"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-04-24T00:15:00Z",
    "severity": "HIGH"
  },
  "details": "Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma-\u003evm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.",
  "id": "GHSA-33f2-r445-jvq6",
  "modified": "2022-05-24T17:16:24Z",
  "published": "2022-05-24T17:16:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15794"
    },
    {
      "type": "WEB",
      "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=270d16ae48a4dbf1c7e25e94cc3e38b4bea37635"
    },
    {
      "type": "WEB",
      "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=ef81780548d20a786cc77ed4203fca146fd81ce3"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/usn/usn-4208-1"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/usn/usn-4209-1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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