CVE-2021-47170
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…
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002ebPatch
- https://git.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83Patch
- https://git.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392dePatch
- https://git.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2edPatch
- https://git.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098Patch
- https://git.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002ebPatch
- https://git.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83Patch
- https://git.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392dePatch
- https://git.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2edPatch
- https://git.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.