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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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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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}



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