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…

PriorityP419medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.22%

13.2th percentile

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.

Affected

13 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.15.5-1 (bookworm)	linux 5.15.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= c3083c80b52c4e29b65ed838d2e66a91b13a3152 < a14d7038ea201c5526375becfc43b9ba281b1e82	a14d7038ea201c5526375becfc43b9ba281b1e82
linux	linux	>= c3083c80b52c4e29b65ed838d2e66a91b13a3152 < e52fecdd0c142b95c720683885b06ee3f0e065c8	e52fecdd0c142b95c720683885b06ee3f0e065c8
linux	linux	>= c3083c80b52c4e29b65ed838d2e66a91b13a3152 < 118c826ef8b43efe0fda8faf419673707ee8c5e5	118c826ef8b43efe0fda8faf419673707ee8c5e5
linux	linux	>= c3083c80b52c4e29b65ed838d2e66a91b13a3152 < 3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50	3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50
linux	linux_kernel	< 5.4.162	5.4.162
linux	linux_kernel	>= 0 < 5.10.84-1	5.10.84-1
linux	linux_kernel	>= 0 < 5.15.5-1	5.15.5-1
linux	linux_kernel	>= 0 < 5.15.5-1	5.15.5-1
linux	linux_kernel	>= 0 < 5.15.5-1	5.15.5-1
linux	linux_kernel	>= 5.11 < 5.15.5	5.15.5
linux	linux_kernel	>= 5.5 < 5.10.82	5.10.82

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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