CVE-2021-47280 (GCVE-0-2021-47280)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:20 – Updated: 2026-05-11 13:51
VLAI
Title
drm: Fix use-after-free read in drm_getunique()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:39 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5acc614ac47465fee6375a9af4740f618830762d , < 17dab9326ff263c62dab1dbac4492e2938a049e4 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < 7d233ba700ceb593905ea82b42dadb4ec8ef85e9 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < b246b4c70c1250e7814f409b243000f9c0bf79a3 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < 491d52e0078860b33b6c14f0a7ac74ca1b603bd6 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < f773f8cccac13c7e7bbd9182e7996c727742488e (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < b436acd1cf7fac0ba987abd22955d98025c80c2b (git)
Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 4.14.237 , ≤ 4.14.* (semver)
Unaffected: 4.19.195 , ≤ 4.19.* (semver)
Unaffected: 5.4.126 , ≤ 5.4.* (semver)
Unaffected: 5.10.44 , ≤ 5.10.* (semver)
Unaffected: 5.12.11 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm: corrige la lectura de use after free en drm_getunique(). Hay un error de tiempo de verificaci\u00f3n a tiempo de uso en drm_getunique() debido a la recuperaci\u00f3n de file_priv. -\u0026gt;master antes de bloquear el mutex maestro del dispositivo. Se puede ver un ejemplo en el informe de fallo del error de use after free encontrado por Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 En el informe, el puntero maestro se utiliz\u00f3 despu\u00e9s de ser liberado. Esto se debe a que otro proceso adquiri\u00f3 el mutex maestro del dispositivo en drm_setmaster_ioctl() y luego sobrescribi\u00f3 fpriv-\u0026gt;master en drm_new_set_master(). El antiguo valor de fpriv-\u0026gt;master se liber\u00f3 posteriormente antes de que se desbloqueara el mutex. Para solucionar este problema, bloqueamos el mutex maestro del dispositivo antes de recuperar el puntero desde fpriv-\u0026gt;master. Este parche pasa la prueba del reproductor Syzbot."
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}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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