CVE-2021-47239

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-05-21. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2021-33887 (ENISA EUVD) · GHSA-747f-wh5x-mp2p (GitHub Security Advisories)Source: ENISA EUVD

7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 21, 2024

Last Modified

December 30, 2024

Advisory Details (8)

Auto-updated Oct 28, 2026
Patch available.
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d
Web page

net: usb: fix possible use-after-free in smsc75xx_bind - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.46-1: fixed in 5.10.46-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.46-1: fixed in 5.10.46-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.46-1: fixed in 5.10.46-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.46-1: fixed in 5.10.46-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 39× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 207 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 110 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  4. 2026-10-30 16:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  5. 2026-10-29 16:29 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  7. 2026-10-28 07:39 UTCEG score recompute
  8. 2026-10-28 07:39 UTCGHSA enrichmentGHSA-747f-wh5x-mp2p · GitHub severity HIGH · GitHub CVSS 7.8
  9. 2026-10-27 16:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  11. 2026-10-25 18:18 UTCEG score recompute
  12. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-10-23 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-10-22 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-10-21 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-10-21 08:34 UTCEG score recompute
  18. 2026-10-21 08:34 UTCGHSA enrichmentGHSA-747f-wh5x-mp2p · GitHub severity HIGH · GitHub CVSS 7.8
  19. 2026-10-20 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-10-19 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-10-18 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-10-18 08:49 UTCEG score recompute
  23. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-10-16 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  25. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
Show 72 more
  1. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-13 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-12 19:05 UTCEG score recompute
  4. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-10-11 23:31 UTCEG score recompute
  6. 2026-10-11 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  7. 2026-10-11 01:31 UTCOSV refresh
  8. 2026-10-10 19:56 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-09 20:04 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  10. 2026-10-08 16:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-10-06 15:14 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-10-05 17:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-10-04 23:19 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-10-03 14:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-10-02 16:23 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-09-30 15:45 UTCEG score recompute
  18. 2026-09-30 15:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-09-29 15:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-09-28 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-09-26 15:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-09-26 00:21 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  23. 2026-09-24 14:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-09-23 13:45 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-09-22 14:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  26. 2026-09-21 20:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  27. 2026-09-21 13:19 UTCOSV refresh
  28. 2026-09-20 20:13 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  29. 2026-09-19 15:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  30. 2026-09-18 19:24 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  31. 2026-09-17 19:23 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  32. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  33. 2026-09-15 03:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  34. 2026-09-12 14:57 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  35. 2026-09-11 14:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  36. 2026-09-11 09:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  37. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  38. 2026-09-07 15:58 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  39. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  40. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  41. 2026-09-04 13:57 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  42. 2026-09-04 05:03 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  43. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  44. 2026-09-02 10:34 UTCOSV refresh
  45. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  46. 2026-08-30 19:14 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  47. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  48. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  49. 2026-08-27 14:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  50. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  51. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  52. 2026-08-24 14:13 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  53. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  54. 2026-08-20 22:52 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  55. 2026-08-19 17:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  56. 2026-08-18 13:45 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  57. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  58. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  59. 2026-08-16 08:50 UTCOSV refresh
  60. 2026-08-16 02:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  61. 2026-08-15 01:27 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  62. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  63. 2026-08-11 13:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  64. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  65. 2026-08-08 16:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  66. 2026-08-07 16:24 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  67. 2026-08-06 13:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  68. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  69. 2026-08-04 15:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  70. 2026-08-04 10:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  71. 2026-08-03 10:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  72. 2026-08-02 02:24 UTCEPSS rescoreEPSS 0.2% · 13th percentile

Frequently asked(5)

What is CVE-2021-47239?
CVE-2021-47239 is a high-severity vulnerability; its CVE record was published on May 21, 2024. 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…
When was the CVE record for CVE-2021-47239 published?
The CVE record for CVE-2021-47239 was published on May 21, 2024. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of December 30, 2024; the record at its source may have been updated since.
Is CVE-2021-47239 actively exploited?
CVE-2021-47239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-47239?
CVE-2021-47239 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47239?
A fix for CVE-2021-47239 is available: update to the fixed version the vendor names in its advisory.

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