FKIE_CVE-2026-23213

Vulnerability from fkie_nvd - Published: 2026-02-18 15:18 - Updated: 2026-03-18 20:35
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: drm/amd/pm: Disable MMIO access during SMU Mode 1 reset During Mode 1 reset, the ASIC undergoes a reset cycle and becomes temporarily inaccessible via PCIe. Any attempt to access MMIO registers during this window (e.g., from interrupt handlers or other driver threads) can result in uncompleted PCIe transactions, leading to NMI panics or system hangs. To prevent this, set the `no_hw_access` flag to true immediately after triggering the reset. This signals other driver components to skip register accesses while the device is offline. A memory barrier `smp_mb()` is added to ensure the flag update is globally visible to all cores before the driver enters the sleep/wait state. (cherry picked from commit 7edb503fe4b6d67f47d8bb0dfafb8e699bb0f8a4)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0de604d0357d0d22cbf03af1077d174b641707b6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1853ebbec980d5c05d431bfd6ded73b1363fd00Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/pm: Disable MMIO access during SMU Mode 1 reset\n\nDuring Mode 1 reset, the ASIC undergoes a reset cycle and becomes\ntemporarily inaccessible via PCIe. Any attempt to access MMIO registers\nduring this window (e.g., from interrupt handlers or other driver threads)\ncan result in uncompleted PCIe transactions, leading to NMI panics or\nsystem hangs.\n\nTo prevent this, set the `no_hw_access` flag to true immediately after\ntriggering the reset. This signals other driver components to skip\nregister accesses while the device is offline.\n\nA memory barrier `smp_mb()` is added to ensure the flag update is\nglobally visible to all cores before the driver enters the sleep/wait\nstate.\n\n(cherry picked from commit 7edb503fe4b6d67f47d8bb0dfafb8e699bb0f8a4)"
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amd/pm: Deshabilitar el acceso MMIO durante el reinicio del Modo 1 de SMU\n\nDurante el reinicio del Modo 1, el ASIC se somete a un ciclo de reinicio y se vuelve temporalmente inaccesible a trav\u00e9s de PCIe. Cualquier intento de acceder a los registros MMIO durante esta ventana (por ejemplo, desde manejadores de interrupciones u otros hilos del controlador) puede resultar en transacciones PCIe incompletas, lo que lleva a p\u00e1nicos NMI o cuelgues del sistema.\n\nPara evitar esto, establecer la bandera \u0027no_hw_access\u0027 en verdadero inmediatamente despu\u00e9s de activar el reinicio. Esto indica a otros componentes del controlador que omitan los accesos a registros mientras el dispositivo est\u00e1 fuera de l\u00ednea.\n\nSe a\u00f1ade una barrera de memoria \u0027smp_mb()\u0027 para asegurar que la actualizaci\u00f3n de la bandera sea globalmente visible para todos los n\u00facleos antes de que el controlador entre en el estado de suspensi\u00f3n/espera.\n\n(seleccionado de la confirmaci\u00f3n 7edb503fe4b6d67f47d8bb0dfafb8e699bb0f8a4)"
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          "confidentialityImpact": "NONE",
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