{"cve":"CVE-2022-49090","nvd":{"published":"2025-02-26T07:00:46.337","modified":"2026-06-17T05:17:03.140","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narch/arm64: Fix topology initialization for core scheduling\n\nArm64 systems rely on store_cpu_topology() to call update_siblings_masks()\nto transfer the toplogy to the various cpu masks. This needs to be done\nbefore the call to notify_cpu_starting() which tells the scheduler about\neach cpu found, otherwise the core scheduling data structures are setup\nin a way that does not match the actual topology.\n\nWith smt_mask not setup correctly we bail on `cpumask_weight(smt_mask) == 1`\nfor !leaders in:\n\n notify_cpu_starting()\n   cpuhp_invoke_callback_range()\n     sched_cpu_starting()\n       sched_core_cpu_starting()\n\nwhich leads to rq->core not being correctly set for !leader-rq's.\n\nWithout this change stress-ng (which enables core scheduling in its prctl\ntests in newer versions -- i.e. with PR_SCHED_CORE support) causes a warning\nand then a crash (trimmed for legibility):\n\n[ 1853.805168] ------------[ cut here ]------------\n[ 1853.809784] task_rq(b)->core != rq->core\n[ 1853.809792] WARNING: CPU: 117 PID: 0 at kernel/sched/fair.c:11102 cfs_prio_less+0x1b4/0x1c4\n...\n[ 1854.015210] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n...\n[ 1854.231256] Call trace:\n[ 1854.233689]  pick_next_task+0x3dc/0x81c\n[ 1854.237512]  __schedule+0x10c/0x4cc\n[ 1854.240988]  schedule_idle+0x34/0x54","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":["CWE-476"],"references":["https://git.kernel.org/stable/c/5524cbb1bfcdff0cad0aaa9f94e6092002a07259","https://git.kernel.org/stable/c/790c1567582bda8f1153015436e3330a7c6eb278","https://git.kernel.org/stable/c/87f5d66daa5f457449bb95d6b8d18bb7596aa627","https://git.kernel.org/stable/c/c78a1b2d0bff678570c8dc9f14035606f5e5257d"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49090","score":0.00246,"percentile":0.15912,"date":"2026-10-31"},"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."]}