7.8

CVE-2021-47239: net: usb: fix possible use-after-free in smsc75xx_bind

Analyzed
AliasesUBUNTU-CVE-2021-47239DEBIAN-CVE-2021-47239
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47239 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.23%
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 7 · Related 7
SUSE-SU-2024:1979-1SUSE-SU-2024:1983-1SUSE-SU-2024:2010-1SUSE-SU-2024:2183-1SUSE-SU-2024:2184-1SUSE-SU-2024:2185-1

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: usb: fix possible use-after-free in smsc75xx_bind The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") fails to clean up the work scheduled in smsc75xx_reset-> smsc75xx_set_multicast, which leads to use-after-free if the work is scheduled to start after the deallocation. In addition, this patch also removes a dangling pointer - dev->data[0]. This patch calls cancel_work_sync to cancel the scheduled work and set the dangling pointer to NULL.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% 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.

Ubuntu85 products
  • linux< 4.15.0-156.163 | < 5.4.0-81.91
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1111.118 | < 5.4.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 200dbfcad8011e50c3cec269ed7b980836eeb1fa, < 7cc8b2e05fcea6edd022d26e82091d781af8fd9b | ≥ 22c840596af0c09068b6cf948616e6496e59e07f, < 64160d1741a3de5204d1a822e058e0b4cc526504 | ≥ 9e6b8c1ff9d997e1fa16cbd2d60739adf6dc1bbc, < c4e3be2e7742863e454ce31faf8fd0109c00050b | ≥ 9e6a3eccb28779710cbbafc4f4258d92509c6d07, < 2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b | ≥ b95fb96e6339e34694dd578fb6bde3575b01af17, < 4252bf6c2b245f47011098113d405ffad6ad5d5b | ≥ 635ac38b36255d3cfb8312cf7c471334f4d537e0, < 570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb | ≥ 70c886ac93f87ae7214a0c69151a28a8075dd95b, < 14616c372a7be01a2fb8c56c9d8debd232b9e43d | ≥ 46a8b29c6306d8bbfd92b614ef65a47c900d8e70, < 56b786d86694e079d8aad9b314e015cd4ac02a3d | ≥ 4.4.271, < 4.4.274 | ≥ 4.9.271, < 4.9.274 | ≥ 4.14.235, < 4.14.238 | ≥ 4.19.193, < 4.19.196 | ≥ 5.4.124, < 5.4.128 | ≥ 5.10.42, < 5.10.46 | ≥ 5.12.9, < 5.12.13
  • linux_kernel≥ 4.4.271, < 4.4.274 | ≥ 4.9.271, < 4.9.274 | ≥ 4.14.235, < 4.14.238 | ≥ 4.19.193, < 4.19.196 | ≥ 5.4.124, < 5.4.128 | ≥ 5.10.42, < 5.10.46 | ≥ 5.12.9, < 5.12.13
Debian1 product
  • linux< 5.10.46-1

3 vendors · 88 products

References

12 links
Show all 12 references