{"cve":"CVE-2025-40263","nvd":{"published":"2025-12-04T16:16:20.340","modified":"2026-10-18T18:10:00.100","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: cros_ec_keyb - fix an invalid memory access\n\nIf cros_ec_keyb_register_matrix() isn't called (due to\n`buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev->idev` remains\nNULL.  An invalid memory access is observed in cros_ec_keyb_process()\nwhen receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work()\nin such case.\n\n  Unable to handle kernel read from unreadable memory at virtual address 0000000000000028\n  ...\n  x3 : 0000000000000000 x2 : 0000000000000000\n  x1 : 0000000000000000 x0 : 0000000000000000\n  Call trace:\n  input_event\n  cros_ec_keyb_work\n  blocking_notifier_call_chain\n  ec_irq_thread\n\nIt's still unknown about why the kernel receives such malformed event,\nin any cases, the kernel shouldn't access `ckdev->idev` and friends if\nthe driver doesn't intend to initialize them.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/2d251c15c27e2dd16d6318425d2f7260cbd47d39","https://git.kernel.org/stable/c/6d81068685154535af06163eb585d6d9663ec7ec","https://git.kernel.org/stable/c/9cf59f4724a9ee06ebb06c76b8678ac322e850b7","https://git.kernel.org/stable/c/d74864291cb8bd784d44d1d02e87109cf88666bb","https://git.kernel.org/stable/c/e08969c4d65ac31297fcb4d31d4808c789152f68"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-40263","score":0.00193,"percentile":0.0883,"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."]}