CVE-2021-47187

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47187
In the Linux kernel, the following vulnerability has been resolved: arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency The entry/exit latency and minimum residency in state for the idle states of MSM8998 were ..bad: first of all, for all of them the timings were written for CPU sleep but the min-residency-us param was miscalculated (supposedly, while porting this from downstream); Then, the power collapse states are setting PC on both the CPU cluster *and* the L2 cache, which have different timings: in the specific case of L2 the times are higher so these ones should be taken into account instead of the CPU ones. This parameter misconfiguration was not giving particular issues because on MSM8998 there was no CPU scaling at all, so cluster/L2 power collapse was rarely (if ever) hit. When CPU scaling is enabled, though, the wrong timings will produce SoC unstability shown to the user as random, apparently error-less, sudden reboots and/or lockups. This set of parameters are stabilizing the SoC when CPU scaling is ON and when power collapse is frequently hit.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5 Patch
https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 Patch
https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82 Patch
https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8 Patch
https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5 Patch
https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 Patch
https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82 Patch
https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

21 Mar 2025, 11:57

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5 - () https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5 - Patch
References () https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 - () https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 - Patch
References () https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82 - () https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82 - Patch
References () https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8 - () https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE NVD-CWE-noinfo

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5 - () https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5 -
References () https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 - () https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 -
References () https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82 - () https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82 -
References () https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8 - () https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: dts: qcom: msm8998: Se corrige la latencia y residencia del estado inactivo de la CPU/L2 La latencia de entrada/salida y la residencia mínima en el estado para los estados inactivos de MSM8998 eran... malas: en primer lugar, para todos ellos, los tiempos se escribieron para el sueño de la CPU, pero el parámetro min-residency-us se calculó mal (supuestamente, al portar esto desde el lado descendente); luego, los estados de colapso de energía están configurando PC tanto en el clúster de la CPU *como* en el caché L2, que tienen diferentes tiempos: en el caso específico de L2, los tiempos son más altos, por lo que estos deben tenerse en cuenta en lugar de los de la CPU. Esta configuración incorrecta de parámetros no estaba dando problemas particulares porque en MSM8998 no había escalamiento de la CPU en absoluto, por lo que el colapso de energía del clúster/L2 rara vez (o nunca) se veía afectado. Sin embargo, cuando el escalado de CPU está habilitado, los tiempos incorrectos producirán inestabilidad del SoC, que se mostrará al usuario como reinicios y/o bloqueos repentinos aleatorios, aparentemente sin errores. Este conjunto de parámetros estabiliza el SoC cuando el escalado de CPU está activado y cuando se producen caídas de energía con frecuencia.

10 Apr 2024, 19:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-04-10 19:15

Updated : 2025-03-21 11:57

NVD link : CVE-2021-47187

Mitre link : CVE-2021-47187

CVE.ORG link : CVE-2021-47187

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo