Resource exhaustion in Linux
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 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.
EPSS: 0.002 (14.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions add1aaeabe6b08ed26381a2a06e505b2f09c3ba5, 3.3, 0
- Linux Linux_kernel — versions 5.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2021-47170?
- CVE-2021-47170 is a medium-severity vulnerability in Linux, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.5/10. Published 2024-03-25.
- How severe is CVE-2021-47170?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-47170 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.