CVE-2021-47456

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2024-05-22. NVD baseline CVSS 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

can: peak_pci: peak_pci_remove(): fix UAF

When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF.

Fix this by releasing 'dev' later.

The following log reveals it:

[ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537 [ 35.965513 ] Call Trace: [ 35.965718 ] dump_stack_lvl+0xa8/0xd1 [ 35.966028 ] print_address_description+0x87/0x3b0 [ 35.966420 ] kasan_report+0x172/0x1c0 [ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170 [ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967945 ] __asan_report_load8_noabort+0x14/0x20 [ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.968752 ] pci_device_remove+0xa9/0x250

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 22, 2024

Last Modified

April 2, 2025

Advisory Details (8)

Auto-updated Sep 5, 2026
Patch available.
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69
generic

can: peak_pci: peak_pci_remove(): fix UAF - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38

Vendor Advisories for CVE-2021-47456(2)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-rt-0:4.18.0-553.8.1.rt7.349.el8_102024-07-08redhat
redhatkernel-0:4.18.0-553.8.1.el8_102024-07-02redhat

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.

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 5.14.16-1: fixed in 5.14.16-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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 179 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:40 UTCEPSS rescore
  3. 2026-10-07 23:45 UTCEPSS rescore
  4. 2026-10-06 15:14 UTCEPSS rescore
  5. 2026-10-05 17:40 UTCEPSS rescore
  6. 2026-10-04 23:19 UTCEPSS rescore
  7. 2026-10-03 14:22 UTCEPSS rescore
  8. 2026-10-03 14:22 UTCEPSS rescore
  9. 2026-10-02 16:23 UTCEPSS rescore
  10. 2026-09-30 15:45 UTCEG score recompute
  11. 2026-09-30 15:00 UTCEPSS rescore
  12. 2026-09-29 15:15 UTCEPSS rescore
  13. 2026-09-28 13:47 UTCEPSS rescore
  14. 2026-09-26 15:54 UTCEPSS rescore
  15. 2026-09-26 00:21 UTCEPSS rescore
  16. 2026-09-24 14:00 UTCEPSS rescore
  17. 2026-09-24 14:00 UTCEPSS rescore
  18. 2026-09-23 13:45 UTCEPSS rescore
  19. 2026-09-22 14:44 UTCEPSS rescore
  20. 2026-09-21 20:28 UTCEPSS rescore
  21. 2026-09-21 11:19 UTCOSV refresh
  22. 2026-09-20 20:13 UTCEPSS rescore
  23. 2026-09-19 15:38 UTCEPSS rescore
  24. 2026-09-18 19:24 UTCEPSS rescore
  25. 2026-09-17 19:23 UTCEPSS rescore
Show 75 more
  1. 2026-09-16 14:05 UTCEPSS rescore
  2. 2026-09-16 14:05 UTCEPSS rescore
  3. 2026-09-15 03:06 UTCEPSS rescore
  4. 2026-09-12 14:57 UTCEPSS rescore
  5. 2026-09-11 14:49 UTCEPSS rescore
  6. 2026-09-11 09:33 UTCEPSS rescore
  7. 2026-09-08 21:57 UTCEPSS rescore
  8. 2026-09-07 15:58 UTCEPSS rescore
  9. 2026-09-06 13:45 UTCEPSS rescore
  10. 2026-09-05 15:25 UTCEPSS rescore
  11. 2026-09-04 13:57 UTCEPSS rescore
  12. 2026-09-04 05:03 UTCEPSS rescore
  13. 2026-09-02 14:09 UTCEPSS rescore
  14. 2026-09-02 09:34 UTCOSV refresh
  15. 2026-09-01 13:51 UTCEPSS rescore
  16. 2026-08-30 19:14 UTCEPSS rescore
  17. 2026-08-30 01:19 UTCEPSS rescore
  18. 2026-08-28 21:38 UTCEPSS rescore
  19. 2026-08-27 14:22 UTCEPSS rescore
  20. 2026-08-26 14:43 UTCEPSS rescore
  21. 2026-08-24 14:13 UTCEPSS rescore
  22. 2026-08-21 23:46 UTCEPSS rescore
  23. 2026-08-20 22:52 UTCEPSS rescore
  24. 2026-08-19 17:01 UTCEPSS rescore
  25. 2026-08-18 13:45 UTCEPSS rescore
  26. 2026-08-17 13:44 UTCEPSS rescore
  27. 2026-08-16 14:53 UTCEPSS rescore
  28. 2026-08-16 08:20 UTCOSV refresh
  29. 2026-08-16 02:11 UTCEPSS rescore
  30. 2026-08-15 01:27 UTCEPSS rescore
  31. 2026-08-13 21:57 UTCEPSS rescore
  32. 2026-08-12 13:48 UTCEPSS rescore
  33. 2026-08-11 13:38 UTCEPSS rescore
  34. 2026-08-09 13:44 UTCEPSS rescore
  35. 2026-08-08 16:34 UTCEPSS rescore
  36. 2026-08-07 16:24 UTCEPSS rescore
  37. 2026-08-06 13:44 UTCEPSS rescore
  38. 2026-08-05 19:15 UTCEPSS rescore
  39. 2026-08-04 15:06 UTCEPSS rescore
  40. 2026-08-04 10:34 UTCEPSS rescore
  41. 2026-08-02 02:24 UTCEPSS rescore
  42. 2026-08-01 04:13 UTCEPSS rescore
  43. 2026-08-01 02:12 UTCOSV refresh
  44. 2026-07-30 16:25 UTCEPSS rescore
  45. 2026-07-30 01:28 UTCEPSS rescore
  46. 2026-07-28 15:33 UTCEPSS rescore
  47. 2026-07-26 14:52 UTCEPSS rescore
  48. 2026-07-25 14:15 UTCEPSS rescore
  49. 2026-07-24 14:15 UTCEPSS rescore
  50. 2026-07-24 14:15 UTCEPSS rescore
  51. 2026-07-23 14:16 UTCEPSS rescore
  52. 2026-07-23 02:06 UTCEG score recompute
  53. 2026-07-22 22:53 UTCEG score recompute
  54. 2026-07-22 14:06 UTCEPSS rescore
  55. 2026-07-21 15:22 UTCEPSS rescore
  56. 2026-07-21 15:22 UTCEPSS rescore
  57. 2026-07-20 17:05 UTCEPSS rescore
  58. 2026-07-19 14:29 UTCEPSS rescore
  59. 2026-07-19 02:27 UTCEPSS rescore
  60. 2026-07-19 02:27 UTCEPSS rescore
  61. 2026-07-18 10:02 UTCEPSS rescore
  62. 2026-07-16 17:00 UTCEPSS rescore
  63. 2026-07-16 17:00 UTCEPSS rescore
  64. 2026-07-15 16:55 UTCEPSS rescore
  65. 2026-07-15 01:58 UTCEPSS rescore
  66. 2026-07-15 01:58 UTCEPSS rescore
  67. 2026-07-14 09:25 UTCOSV refresh
  68. 2026-07-13 22:27 UTCEPSS rescore
  69. 2026-07-13 06:11 UTCEPSS rescore
  70. 2026-07-13 06:11 UTCEPSS rescore
  71. 2026-07-12 05:44 UTCEPSS rescore
  72. 2026-07-11 08:25 UTCEPSS rescore
  73. 2026-07-09 19:07 UTCEPSS rescore
  74. 2026-07-09 19:07 UTCEPSS rescore
  75. 2026-07-08 15:12 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-47456?
CVE-2021-47456 is a high vulnerability published on May 22, 2024. In the Linux kernel, the following vulnerability has been resolved: can: peakpci: peakpci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF. Fix this by releasing 'dev' later. The following log reveals it: [ 35.961814 ] BUG: KASAN:…
When was CVE-2021-47456 disclosed?
CVE-2021-47456 was first published on May 22, 2024, with the most recent update on April 2, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47456 actively exploited?
CVE-2021-47456 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-2021-47456?
CVE-2021-47456 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2021-47456?
A fix for CVE-2021-47456 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-47456 are linked in the Vendor Advisories panel on this page.

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