{"cve":"CVE-2026-90389","nvd":{"published":"2026-09-17T17:17:38.427","modified":"2026-10-19T09:19:32.977","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: scope memalloc_noio to allocation critical sections\n\nStoring a memalloc_noio_save() token in mddev->noio_flags lets one task\nsave the token and another task restore it. With concurrent suspend sysfs\nwrites, task A can enter PF_MEMALLOC_NOIO, return to userspace still in\nthat scope, and later task B can restore A's saved token.\n\nAvoid tying the token lifetime to mddev. Keep mddev_suspend() and\nmddev_resume() only responsible for array suspension, and enter\nPF_MEMALLOC_NOIO only in the MD paths that allocate memory after the array\nhas been suspended. Restore the token before resuming the array.\n\nA reproducer repeatedly writes suspend_lo and suspend_hi from concurrent\nworkers and checks each worker's /proc/self/stat flags before and after the\nsysfs write.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/28fdea874f68cac6c36651b1fc7272fd2199c48d","https://git.kernel.org/stable/c/72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045","https://git.kernel.org/stable/c/a58923756b0f8e71032070c23ae0b167e46731da","https://git.kernel.org/stable/c/bace2010dd7ac07bc980575afb135c406730a7fe"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-90389","score":0.002,"percentile":0.09719,"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."]}