Riskcovery

CVE-2021-47170

USB: usbfs: Don't WARN about excessively large memory allocations

State
Published
Severity
Not scored
Published
Mar 25, 2024
Updated
May 11, 2026
Reserved
Mar 25, 2024

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 to before 2ab21d6e1411999b5fb43434f421f00bf50002ebAffected
  • add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 to before 2c835fede13e03f2743a333e4370b5ed2db91e83Affected
  • add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 to before 8d83f109e920d2776991fa142bb904d985dca2edAffected
  • add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 to before 9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098Affected
  • add1aaeabe6b08ed26381a2a06e505b2f09c3ba5 to before 4f2629ea67e7225c3fd292c7fe4f5b3c9d6392deAffected
LinuxLinux
  • 3.3Affected
  • before 3.3Not affected
  • 4.19.193 through 4.19.*Not affected
  • 5.4.124 through 5.4.*Not affected
  • 5.10.42 through 5.10.*Not affected
  • 5.12.9 through 5.12.*Not affected
  • 5.13 and laterNot affected

References

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