CVE-2021-47334 (GCVE-0-2021-47334)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI
Title
misc/libmasm/module: Fix two use after free in ibmasm_init_one
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-21 18:44 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < 1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069 (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < 29ba8e2ba89ee2862a26d91204dd5fe77ceee25a (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < 5b06ca113bf197aab2ab61288f42506e0049fbab (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < 481a76d4749ee3a27f902ba213fdcbb4bb39720e (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < 38660031e80eaa6cc9370b031c180612f414b00d (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < b9c87ce3bc6331f82811a8cf8e930423c22523a3 (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < ef1067d2baa847d53c9988510d99fb494de4d12c (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < a7268e8a227d5a4f0bd1584f556246b0224ab274 (git)
Affected: 736ce43295682d060f2b93624b4a339f9af6aab1 , < 7272b591c4cb9327c43443f67b8fbae7657dd9ae (git)
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Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 4.4.276 , ≤ 4.4.* (semver)
Unaffected: 4.9.276 , ≤ 4.9.* (semver)
Unaffected: 4.14.240 , ≤ 4.14.* (semver)
Unaffected: 4.19.198 , ≤ 4.19.* (semver)
Unaffected: 5.4.134 , ≤ 5.4.* (semver)
Unaffected: 5.10.52 , ≤ 5.10.* (semver)
Unaffected: 5.12.19 , ≤ 5.12.* (semver)
Unaffected: 5.13.4 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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            "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."
          }
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            "title": "CVE Program Container"
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                  "content": {
                    "id": "CVE-2021-47334",
                    "options": [
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                  "versionType": "original_commit_for_fix"
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              "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."
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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              "url": "https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a"
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              "url": "https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47334",
        "datePublished": "2024-05-21T14:35:44.404Z",
        "dateReserved": "2024-05-21T14:28:16.977Z",
        "dateUpdated": "2025-12-18T11:36:56.389Z",
        "state": "PUBLISHED"
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}



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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

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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.


Detection rules are retrieved from Rulezet.


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.