FKIE_CVE-2021-47494

Vulnerability from fkie_nvd - Published: 2024-05-22 09:15 - Updated: 2025-09-24 19:14
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: cfg80211: fix management registrations locking The management registrations locking was broken, the list was locked for each wdev, but cfg80211_mgmt_registrations_update() iterated it without holding all the correct spinlocks, causing list corruption. Rather than trying to fix it with fine-grained locking, just move the lock to the wiphy/rdev (still need the list on each wdev), we already need to hold the wdev lock to change it, so there's no contention on the lock in any case. This trivially fixes the bug since we hold one wdev's lock already, and now will hold the lock that protects all lists.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncfg80211: fix management registrations locking\n\nThe management registrations locking was broken, the list was\nlocked for each wdev, but cfg80211_mgmt_registrations_update()\niterated it without holding all the correct spinlocks, causing\nlist corruption.\n\nRather than trying to fix it with fine-grained locking, just\nmove the lock to the wiphy/rdev (still need the list on each\nwdev), we already need to hold the wdev lock to change it, so\nthere\u0027s no contention on the lock in any case. This trivially\nfixes the bug since we hold one wdev\u0027s lock already, and now\nwill hold the lock that protects all lists."
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      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: cfg80211: corrige el bloqueo de registros de administraci\u00f3n. El bloqueo de registros de administraci\u00f3n estaba roto, la lista estaba bloqueada para cada wdev, pero cfg80211_mgmt_registrations_update() la repiti\u00f3 sin mantener todos los spinlocks correctos, lo que provoc\u00f3 corrupci\u00f3n en la lista. En lugar de intentar solucionarlo con un bloqueo detallado, simplemente mueva el bloqueo a wiphy/rdev (a\u00fan necesitamos la lista en cada wdev), ya necesitamos mantener presionado el bloqueo wdev para cambiarlo, por lo que no hay contenci\u00f3n en el bloqueo. En todo caso. Esto soluciona trivialmente el error ya que ya tenemos un bloqueo de wdev y ahora mantendremos el bloqueo que protege todas las listas."
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  "id": "CVE-2021-47494",
  "lastModified": "2025-09-24T19:14:50.907",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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