# CVE-2021-47170: linux: In the Linux kernel, the following vulnerability has been resolved:  USB: usbfs: Don't WARN about excessively large m...

CVE-2021-47170 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47170, released March 25, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47170
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  USB: usbfs: Don't WARN about excessively large memory allocations  Syzbot found that the kernel generates a WARNing if the user tries to submit a bulk transfer through usbfs with a buffer that is way too large.  This isn't a bug in the kernel; it's merely an invalid request from the user and the usbfs code does handle it correctly.  In theory the same thing can happen with async transfers, or with the packet descriptor table for isochronous transfers.  To prevent the MM subsystem from complaining about these bad allocation requests, add the __GFP_NOWARN flag to the kmalloc calls for these buffers.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47170](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47170.md) | Mar 25, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47170](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47170.md) | Mar 25, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47170](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47170.md) | Mar 25, 2024 |

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