CVE-2021-47321 (GCVE-0-2021-47321)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2025-05-04 07:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free by calling del_timer_sync() This driver'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/1a053c4d716898a53c2e31c574a70ea0c37044a3 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a 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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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: perro guardi\u00e1n: solucione el posible use after free llamando a del_timer_sync(). La ruta de eliminaci\u00f3n de este controlador 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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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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