lsn-0077-1
Vulnerability from osv_ubuntu
Published
2021-05-17 07:04
Modified
2026-06-03 10:46
Summary
Kernel Live Patch Security Notice
Details

Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code.(CVE-2021-3492)

References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gke_(\\d+)",
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        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_(?:generic|lowlatency)_(\\d+)",
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      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux",
        "purl": "pkg:deb/ubuntu/linux@5.4.0-72.80?arch=source\u0026distro=focal"
      },
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        "module_version": "77"
      },
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    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gkeop_(\\d+)",
        "module_version": "77"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
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      },
      "ranges": [
        {
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            {
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            },
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            }
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      ],
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        "5.4.0-1012.13",
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      ]
    }
  ],
  "aliases": [],
  "details": "Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux\nkernel did not properly handle faults in copy_from_user() when passing\nthrough ioctls to an underlying file system. A local attacker could use\nthis to cause a denial of service (memory exhaustion) or execute arbitrary\ncode.(CVE-2021-3492)",
  "id": "LSN-0077-1",
  "modified": "2026-06-03T10:46:31Z",
  "published": "2021-05-17T07:04:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/LSN-0077-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3492"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "Kernel Live Patch Security Notice",
  "upstream": [
    "UBUNTU-CVE-2021-3492"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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