CVE-2021-47459

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-05-22. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv

It will trigger UAF for rx_kref of j1939_priv as following.

cpu0 cpu1 j1939_sk_bind(socket0, ndev0, ...) j1939_netdev_start j1939_sk_bind(socket1, ndev0, ...) j1939_netdev_start j1939_priv_set j1939_priv_get_by_ndev_locked j1939_jsk_add ..... j1939_netdev_stop kref_put_lock(&priv->rx_kref, ...) kref_get(&priv->rx_kref, ...) REFCOUNT_WARN("addition on 0;...")

==================================================== refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 20874 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 RIP: 0010:refcount_warn_saturate+0x169/0x1e0 Call Trace: j1939_netdev_start+0x68b/0x920 j1939_sk_bind+0x426/0xeb0 ? security_socket_bind+0x83/0xb0

The rx_kref's kref_get() and kref_put() should use j1939_netdev_lock to protect.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

May 22, 2024

Last Modified

August 5, 2026

Advisory Details (4)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586
generic

can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a0e47d2833b4f65e6c799f28c6b636d36b8b936d
generic

can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668
generic

can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132f

Vendor Advisories for CVE-2021-47459(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:5.14.0-427.28.1.el9_42024-07-31redhat
redhatkernel-0:5.14.0-284.75.1.el9_22024-07-24redhat
redhatkernel-rt-0:5.14.0-284.75.1.rt14.360.el9_22024-07-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-06 13:44 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
  4. 2026-08-05 09:40 UTCEG score recompute
  5. 2026-08-05 09:40 UTCVendor advisory
  6. 2026-08-05 09:40 UTCGHSA enrichment
  7. 2026-08-04 15:06 UTCEPSS rescore
  8. 2026-08-04 12:10 UTCEG score recompute
  9. 2026-08-04 12:10 UTCVendor advisory
  10. 2026-08-04 12:10 UTCGHSA enrichment
  11. 2026-08-04 10:34 UTCEPSS rescore
  12. 2026-08-04 09:50 UTCEG score recompute
  13. 2026-08-04 09:50 UTCVendor advisory
  14. 2026-08-04 09:50 UTCGHSA enrichment
  15. 2026-08-03 10:33 UTCEPSS rescore
  16. 2026-08-02 02:24 UTCEPSS rescore
  17. 2026-08-01 02:12 UTCOSV refresh
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  1. 2026-07-23 02:06 UTCEG score recompute
  2. 2026-07-22 22:53 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-20 17:05 UTCEPSS rescore
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  16. 2026-07-14 09:25 UTCOSV refresh
  17. 2026-07-13 22:27 UTCEPSS rescore
  18. 2026-07-13 06:11 UTCEPSS rescore
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  20. 2026-07-12 05:44 UTCEPSS rescore
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  22. 2026-07-09 19:07 UTCEPSS rescore
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  24. 2026-07-08 15:12 UTCEPSS rescore
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  26. 2026-07-07 13:43 UTCEPSS rescore
  27. 2026-07-06 16:25 UTCEPSS rescore
  28. 2026-07-06 16:25 UTCEPSS rescore
  29. 2026-07-06 02:21 UTCEPSS rescore
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  42. 2026-06-27 03:07 UTCEPSS rescore
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  44. 2026-06-26 10:07 UTCOSV refresh
  45. 2026-06-25 13:48 UTCEPSS rescore
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  47. 2026-06-24 14:03 UTCEPSS rescore
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  49. 2026-06-23 21:31 UTCEPSS rescore
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  51. 2026-06-22 14:24 UTCEPSS rescore
  52. 2026-06-21 14:55 UTCEPSS rescore
  53. 2026-06-21 01:58 UTCEPSS rescore
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  55. 2026-06-19 19:24 UTCEPSS rescore
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  57. 2026-06-18 17:51 UTCEPSS rescore
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  68. 2026-06-11 13:58 UTCEPSS rescore
  69. 2026-06-10 22:16 UTCEPSS rescore
  70. 2026-06-10 13:20 UTCEPSS rescore
  71. 2026-06-08 16:41 UTCOSV refresh
  72. 2026-06-08 14:15 UTCEPSS rescore
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  74. 2026-06-08 14:15 UTCEPSS rescore
  75. 2026-06-07 15:23 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-47459?
CVE-2021-47459 is a high vulnerability published on May 22, 2024. In the Linux kernel, the following vulnerability has been resolved: can: j1939: j1939netdevstart(): fix UAF for rxkref of j1939priv It will trigger UAF for rxkref of j1939priv as following. cpu0 cpu1 j1939skbind(socket0, ndev0, ...) j1939netdevstart j1939skbind(socket1, ndev0, ...) j1939netdevstart…
When was CVE-2021-47459 disclosed?
CVE-2021-47459 was first published in the National Vulnerability Database on May 22, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47459 actively exploited?
CVE-2021-47459 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.9% of all scored CVEs.
What is the CVSS score of CVE-2021-47459?
CVE-2021-47459 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47459?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47459, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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