{"cve":"CVE-2025-21694","nvd":{"published":"2025-02-12T14:15:32.463","modified":"2026-10-15T02:17:27.130","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc: fix softlockup in __read_vmcore (part 2)\n\nSince commit 5cbcb62dddf5 (\"fs/proc: fix softlockup in __read_vmcore\") the\nnumber of softlockups in __read_vmcore at kdump time have gone down, but\nthey still happen sometimes.\n\nIn a memory constrained environment like the kdump image, a softlockup is\nnot just a harmless message, but it can interfere with things like RCU\nfreeing memory, causing the crashdump to get stuck.\n\nThe second loop in __read_vmcore has a lot more opportunities for natural\nsleep points, like scheduling out while waiting for a data write to\nhappen, but apparently that is not always enough.\n\nAdd a cond_resched() to the second loop in __read_vmcore to (hopefully)\nget rid of the softlockups.","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/649b266606bc413407ce315f710c8ce8a88ee30a","https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836","https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87","https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713","https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:18.731010617+00:00"},"epss":{"cve":"CVE-2025-21694","score":0.00242,"percentile":0.15251,"date":"2026-10-25"},"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."]}