FKIE_CVE-2021-47334

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/ibmasm/module.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "29ba8e2ba89ee2862a26d91204dd5fe77ceee25a",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "5b06ca113bf197aab2ab61288f42506e0049fbab",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "481a76d4749ee3a27f902ba213fdcbb4bb39720e",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "38660031e80eaa6cc9370b031c180612f414b00d",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "b9c87ce3bc6331f82811a8cf8e930423c22523a3",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "ef1067d2baa847d53c9988510d99fb494de4d12c",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "a7268e8a227d5a4f0bd1584f556246b0224ab274",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            },
            {
              "lessThan": "7272b591c4cb9327c43443f67b8fbae7657dd9ae",
              "status": "affected",
              "version": "736ce43295682d060f2b93624b4a339f9af6aab1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/ibmasm/module.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.16"
            },
            {
              "lessThan": "2.6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.276",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.276",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.240",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "10282F37-B17F-4974-967E-FCD5ABC9AB8E",
              "versionEndExcluding": "4.4.276",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C79FFC06-9530-4CD7-B651-01D786CC925E",
              "versionEndExcluding": "4.9.276",
              "versionStartIncluding": "4.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FB359B2E-773D-4D52-9915-E07A47ABE72B",
              "versionEndExcluding": "4.14.240",
              "versionStartIncluding": "4.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B93AEDB9-C52B-4222-8F9A-882DAD9EF5B2",
              "versionEndExcluding": "4.19.198",
              "versionStartIncluding": "4.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "508D9771-335F-44A6-9F2F-880DF1267A1F",
              "versionEndExcluding": "5.4.134",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7C1E6FB6-53C8-4DC4-8AE5-93094BA39F62",
              "versionEndExcluding": "5.10.52",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "34C1A2F4-DD44-4CF1-8FD4-751A0D746A9E",
              "versionEndExcluding": "5.12.19",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F93FA3CC-0C79-410B-A7D7-245C2AA0723A",
              "versionEndExcluding": "5.13.4",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc/libmasm/module: Fix two use after free in ibmasm_init_one\n\nIn ibmasm_init_one, it calls ibmasm_init_remote_input_dev().\nInside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are\nallocated by input_allocate_device(), and assigned to\nsp-\u003eremote.mouse_dev and sp-\u003eremote.keybd_dev respectively.\n\nIn the err_free_devices error branch of ibmasm_init_one,\nmouse_dev and keybd_dev are freed by input_free_device(), and return\nerror. Then the execution runs into error_send_message error branch\nof ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called\nto unregister the freed sp-\u003eremote.mouse_dev and sp-\u003eremote.keybd_dev.\n\nMy patch add a \"error_init_remote\" label to handle the error of\nibmasm_init_remote_input_dev(), to avoid the uaf bugs."
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: misc/libmasm/module: corrige dos use after free en ibmasm_init_one. En ibmasm_init_one, llama a ibmasm_init_remote_input_dev(). Dentro de ibmasm_init_remote_input_dev, mouse_dev y keybd_dev son asignados por input_allocate_device() y asignados a sp-\u0026gt;remote.mouse_dev y sp-\u0026gt;remote.keybd_dev respectivamente. En la rama de error err_free_devices de ibmasm_init_one, mouse_dev y keybd_dev se liberan mediante input_free_device() y devuelven un error. Luego, la ejecuci\u00f3n se ejecuta en la rama de error error_send_message de ibmasm_init_one, donde se llama a ibmasm_free_remote_input_dev(sp) para cancelar el registro de sp-\u0026gt;remote.mouse_dev y sp-\u0026gt;remote.keybd_dev liberados. Mi parche agrega una etiqueta \"error_init_remote\" para manejar el error de ibmasm_init_remote_input_dev(), para evitar los errores de uaf."
    }
  ],
  "id": "CVE-2021-47334",
  "lastModified": "2026-06-17T04:17:13.333",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47334",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-21T18:44:43.256479Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:20.273",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.