5.5

CVE-2021-47170: USB: usbfs: Don't WARN about excessively large memory allocations

Analyzed
AliasesUBUNTU-CVE-2021-47170DEBIAN-CVE-2021-47170
Published 25-03-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47170 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
SUSE-SU-2024:1454-1SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1SUSE-SU-2025:01983-1

Timeline

  1. 25-03-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu87 products
  • linuxAll versions (No fix recorded) | < 4.15.0-151.157 | < 5.4.0-80.90
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1109.116 | < 5.4.0-1054.57
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ add1aaeabe6b08ed26381a2a06e505b2f09c3ba5, < 2ab21d6e1411999b5fb43434f421f00bf50002eb | ≥ add1aaeabe6b08ed26381a2a06e505b2f09c3ba5, < 2c835fede13e03f2743a333e4370b5ed2db91e83 | ≥ add1aaeabe6b08ed26381a2a06e505b2f09c3ba5, < 8d83f109e920d2776991fa142bb904d985dca2ed | ≥ add1aaeabe6b08ed26381a2a06e505b2f09c3ba5, < 9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098 | ≥ add1aaeabe6b08ed26381a2a06e505b2f09c3ba5, < 4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de | 3.3
  • linux_kernel< 4.19.193 | ≥ 4.20, < 5.4.124 | ≥ 5.5, < 5.10.42 | ≥ 5.11, < 5.12.9 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3
Debian1 product
  • linux< 5.14.6-1

3 vendors · 90 products

References

8 links