CVE-2021-47323 (GCVE-0-2021-47323)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2025-05-04 07:08
Severity ?
8.8 (High) - CVSS:3.1/AV:N/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: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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La ruta de eliminaci\u00f3n de este m\u00f3dulo llama a del_timer(). Sin embargo, esa funci\u00f3n no espera hasta que finalice el controlador del temporizador. Esto significa que es posible que el controlador del temporizador a\u00fan est\u00e9 ejecut\u00e1ndose despu\u00e9s de que haya finalizado la funci\u00f3n de eliminaci\u00f3n del controlador, lo que dar\u00eda como resultado un use after free. Para solucionarlo, llame a del_timer_sync(), lo que garantiza que el controlador del temporizador haya finalizado y no pueda 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However, that function\\ndoes not wait until the timer handler finishes. This means that the\\ntimer handler may still be running after the driver\u0027s remove function\\nhas finished, which would result in a use-after-free.\\n\\nFix by calling del_timer_sync(), which makes sure the timer handler\\nhas finished, and unable to re-schedule itself.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:39:43.223Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47323\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-04-09T13:29:10.765Z\", \"dateReserved\": \"2024-05-21T14:28:16.974Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:37.181Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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