CVE-2021-3348

HIGHNVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

Score 7.0 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: None knownExposed: 0

A fix is available — apply it.

nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a certain point during device setup, aka CID-b98e762e3d71.

CVSS v3
7.0
EG Score
7.0(medium)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity70% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

February 1, 2021

Last Modified

November 21, 2024

References (8)

Vendor Advisories for CVE-2021-3348(2)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-oem-20.04b (5.10.0.1017.18) @ focal2026-05-26ubuntu
ubuntulinux-image-virtual-hwe-20.04-edge (5.8.0.49.54) @ groovy2026-05-26ubuntu
ubuntulinux-image-oracle (4.15.0.1069.57) @ xenial2026-05-26ubuntu
ubuntulinux-image-virtual-hwe-18.04-edge (5.4.0.71.74) @ focal2026-05-26ubuntu
redhatkernel-rt-0:4.18.0-348.rt7.130.el82021-11-09redhat
redhatkernel-0:4.18.0-348.el82021-11-09redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.13-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.13-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.13-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.13-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
linux-4.194.19.132-1~deb9u1 ... 4.19.171-2~deb9u1 (6 versions)4.19.181-1~deb9u1—

Weakness Classification(2)

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

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× 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 164 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2021-3348?
CVE-2021-3348 is a high vulnerability published on February 1, 2021. nbdaddsocket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndbqueuerq use-after-free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a certain point during device setup, aka CID-b98e762e3d71.
When was CVE-2021-3348 disclosed?
CVE-2021-3348 was first published in the National Vulnerability Database on February 1, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-3348 actively exploited?
CVE-2021-3348 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 83.2% of all scored CVEs.
What is the CVSS score of CVE-2021-3348?
CVE-2021-3348 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2021-3348?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3348, 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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