{"cve":"CVE-2021-47187","nvd":{"published":"2024-04-10T19:15:47.480","modified":"2026-06-17T04:16:51.917","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency\n\nThe entry/exit latency and minimum residency in state for the idle\nstates of MSM8998 were ..bad: first of all, for all of them the\ntimings were written for CPU sleep but the min-residency-us param\nwas miscalculated (supposedly, while porting this from downstream);\nThen, the power collapse states are setting PC on both the CPU\ncluster *and* the L2 cache, which have different timings: in the\nspecific case of L2 the times are higher so these ones should be\ntaken into account instead of the CPU ones.\n\nThis parameter misconfiguration was not giving particular issues\nbecause on MSM8998 there was no CPU scaling at all, so cluster/L2\npower collapse was rarely (if ever) hit.\nWhen CPU scaling is enabled, though, the wrong timings will produce\nSoC unstability shown to the user as random, apparently error-less,\nsudden reboots and/or lockups.\n\nThis set of parameters are stabilizing the SoC when CPU scaling is\nON and when power collapse is frequently hit.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5","https://git.kernel.org/stable/c/3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50","https://git.kernel.org/stable/c/a14d7038ea201c5526375becfc43b9ba281b1e82","https://git.kernel.org/stable/c/e52fecdd0c142b95c720683885b06ee3f0e065c8","https://git.kernel.org/stable/c/118c826ef8b43efe0fda8faf419673707ee8c5e5"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:48:32.179249784+00:00"},"epss":{"cve":"CVE-2021-47187","score":0.00225,"percentile":0.13221,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}