CVE-2021-47387

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

Score 5.5 from GitHub Security Advisory published 2024-05-21. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2021-34392 (ENISA EUVD) · GHSA-jwv9-vf83-vjmw (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

cpufreq: schedutil: Use kobject release() method to free sugov_tunables

The struct sugov_tunables is protected by the kobject, so we can't free it directly. Otherwise we would get a call trace like this: ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x30 WARNING: CPU: 3 PID: 720 at lib/debugobjects.c:505 debug_print_object+0xb8/0x100 Modules linked in: CPU: 3 PID: 720 Comm: a.sh Tainted: G W 5.14.0-rc1-next-20210715-yocto-standard+ #507 Hardware name: Marvell OcteonTX CN96XX board (DT) pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--) pc : debug_print_object+0xb8/0x100 lr : debug_print_object+0xb8/0x100 sp : ffff80001ecaf910 x29: ffff80001ecaf910 x28: ffff00011b10b8d0 x27: ffff800011043d80 x26: ffff00011a8f0000 x25: ffff800013cb3ff0 x24: 0000000000000000 x23: ffff80001142aa68 x22: ffff800011043d80 x21: ffff00010de46f20 x20: ffff800013c0c520 x19: ffff800011d8f5b0 x18: 0000000000000010 x17: 6e6968207473696c x16: 5f72656d6974203a x15: 6570797420746365 x14: 6a626f2029302065 x13: 303378302f307830 x12: 2b6e665f72656d69 x11: ffff8000124b1560 x10: ffff800012331520 x9 : ffff8000100ca6b0 x8 : 000000000017ffe8 x7 : c0000000fffeffff x6 : 0000000000000001 x5 : ffff800011d8c000 x4 : ffff800011d8c740 x3 : 0000000000000000 x2 : ffff0001108301c0 x1 : ab3c90eedf9c0f00 x0 : 0000000000000000 Call trace: debug_print_object+0xb8/0x100 __debug_check_no_obj_freed+0x1c0/0x230 debug_check_no_obj_freed+0x20/0x88 slab_free_freelist_hook+0x154/0x1c8 kfree+0x114/0x5d0 sugov_exit+0xbc/0xc0 cpufreq_exit_governor+0x44/0x90 cpufreq_set_policy+0x268/0x4a8 store_scaling_governor+0xe0/0x128 store+0xc0/0xf0 sysfs_kf_write+0x54/0x80 kernfs_fop_write_iter+0x128/0x1c0 new_sync_write+0xf0/0x190 vfs_write+0x2d4/0x478 ksys_write+0x74/0x100 __arm64_sys_write+0x24/0x30 invoke_syscall.constprop.0+0x54/0xe0 do_el0_svc+0x64/0x158 el0_svc+0x2c/0xb0 el0t_64_sync_handler+0xb0/0xb8 el0t_64_sync+0x198/0x19c irq event stamp: 5518 hardirqs last enabled at (5517): [] console_unlock+0x554/0x6c8 hardirqs last disabled at (5518): [] el1_dbg+0x28/0xa0 softirqs last enabled at (5504): [] __do_softirq+0x4d0/0x6c0 softirqs last disabled at (5483): [] irq_exit+0x1b0/0x1b8

So split the original sugov_tunables_free() into two functions, sugov_clear_global_tunables() is just used to clear the global_tunables and the new sugov_tunables_free() is used as kobj_type::release to release the sugov_tunables safely.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 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
0.3%
EPSS %ILE
16th
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). 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

September 25, 2025

References (7)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+1
  • every version up to 5.10.84-1: fixed in 5.10.84-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.12-1: fixed in 5.14.12-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.12-1: fixed in 5.14.12-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.12-1: fixed in 5.14.12-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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 204 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 107 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 0.3% · 16th percentile
  2. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  3. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  5. 2026-10-29 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  6. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  8. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-10-25 18:18 UTCEG score recompute
  10. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-10-24 21:44 UTCEG score recompute
  12. 2026-10-24 21:44 UTCGHSA enrichmentGHSA-jwv9-vf83-vjmw · GitHub CVSS 5.5
  13. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  14. 2026-10-23 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-22 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
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  19. 2026-10-18 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  20. 2026-10-18 08:49 UTCEG score recompute
  21. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  22. 2026-10-16 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  23. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  24. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  25. 2026-10-13 16:28 UTCEPSS rescoreEPSS 0.3% · 15th percentile
Show 72 more
  1. 2026-10-12 19:05 UTCEG score recompute
  2. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  3. 2026-10-11 23:31 UTCEG score recompute
  4. 2026-10-11 13:44 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  5. 2026-10-10 23:17 UTCOSV refresh
  6. 2026-10-10 19:56 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  7. 2026-10-09 20:04 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-08 16:40 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  10. 2026-10-06 15:14 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  11. 2026-10-05 17:40 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  12. 2026-10-04 23:19 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  13. 2026-10-03 14:22 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  14. 2026-10-02 16:23 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  15. 2026-09-30 15:45 UTCEG score recompute
  16. 2026-09-30 15:00 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  17. 2026-09-29 15:15 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  18. 2026-09-28 13:47 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  19. 2026-09-26 15:54 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  20. 2026-09-26 00:21 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  21. 2026-09-24 14:00 UTCEPSS rescoreEPSS 0.3% · 14th percentile
  22. 2026-09-23 13:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  23. 2026-09-22 14:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  24. 2026-09-21 20:28 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  25. 2026-09-21 11:19 UTCOSV refresh
  26. 2026-09-20 20:13 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  27. 2026-09-19 15:38 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  28. 2026-09-18 19:24 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  30. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  31. 2026-09-15 03:06 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  32. 2026-09-12 14:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  33. 2026-09-11 14:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  34. 2026-09-11 09:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  35. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  36. 2026-09-07 15:58 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  37. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  38. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  39. 2026-09-04 13:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  40. 2026-09-04 05:03 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  41. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  42. 2026-09-02 09:34 UTCOSV refresh
  43. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  44. 2026-08-30 19:14 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  45. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  46. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  47. 2026-08-27 14:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  48. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  51. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  55. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  56. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  57. 2026-08-16 08:20 UTCOSV refresh
  58. 2026-08-16 02:11 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  59. 2026-08-15 01:27 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  60. 2026-08-13 21:57 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  61. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  63. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
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  72. 2026-08-01 04:13 UTCEPSS rescoreEPSS 0.3% · 16th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47387?
CVE-2021-47387 is a medium-severity vulnerability; its CVE record was published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: cpufreq: schedutil: Use kobject release() method to free sugov_tunables The struct sugov_tunables is protected by the kobject, so we can't free it directly. Otherwise we would get a call trace like this: ODEBUG: free active (active…
When was the CVE record for CVE-2021-47387 published?
The CVE record for CVE-2021-47387 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 September 25, 2025; the record at its source may have been updated since.
Is CVE-2021-47387 actively exploited?
CVE-2021-47387 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-47387?
CVE-2021-47387 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2021-47387?
A fix for CVE-2021-47387 is available: update to the fixed version the vendor names in its advisory.

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