{"cve":"CVE-2021-47170","nvd":{"published":"2024-03-25T10:15:08.870","modified":"2026-06-17T04:16:49.400","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: usbfs: Don't WARN about excessively large memory allocations\n\nSyzbot found that the kernel generates a WARNing if the user tries to\nsubmit a bulk transfer through usbfs with a buffer that is way too\nlarge.  This isn't a bug in the kernel; it's merely an invalid request\nfrom the user and the usbfs code does handle it correctly.\n\nIn theory the same thing can happen with async transfers, or with the\npacket descriptor table for isochronous transfers.\n\nTo prevent the MM subsystem from complaining about these bad\nallocation requests, add the __GFP_NOWARN flag to the kmalloc calls\nfor these buffers.","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-770"],"references":["https://git.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002eb","https://git.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83","https://git.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de","https://git.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2ed","https://git.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:47:51.568503435+00:00"},"epss":{"cve":"CVE-2021-47170","score":0.00235,"percentile":0.14552,"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."]}