CVE-2021-22600

CRITICALNVD 6.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.6 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 6%CVSS: 6.6Exploit: cisa kev · ssvc activeExposed: 0

A fix is available — apply it.

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

CVSS v3
6.6
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
6%
EPSS %ILE
92%
KEV
⚠ Exploited

Published

January 26, 2022

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Jun 12, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600
generic Patch Available

[SECURITY] [DSA 5096-1] linux security update

https://www.debian.org/security/2022/dsa-5096
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20230110-0002/
generic Patch Available

[SECURITY] [DLA 2941-1] linux-4.19 security update

https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
generic

net/packet: rx_owner_map depends on pg_vec - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-buildinfo-5.14.0-1022-oem (5.14.0-1022.24) @ focal2026-07-27ubuntu
ubuntulinux-virtual-hwe-20.04 (5.13.0.30.33~20.04.17) @ focal2026-07-27ubuntu
ubuntulinux-image-unsigned-5.13.0-1014-aws (5.13.0-1014.15~20.04.1) @ focal2026-07-27ubuntu
ubuntulinux-headers-azure-fde (5.4.0.1070.73+cvm1.16) @ focal2026-07-27ubuntu
ubuntulinux-tools-4.15.0-1131-azure (4.15.0-1131.144~16.04.1) @ xenial2026-07-27ubuntu
ubuntulinux-image-lowlatency (5.4.0.100.104) @ focal2026-07-27ubuntu
ubuntulinux-tools-5.4.0-1061-gke (5.4.0-1061.64) @ focal2026-07-27ubuntu

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.

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 64× in last 7d / 378× 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 769 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-22600?
CVE-2021-22600 is a critical vulnerability published on January 26, 2022. A double free bug in packetsetring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755
When was CVE-2021-22600 disclosed?
CVE-2021-22600 was first published in the National Vulnerability Database on January 26, 2022, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22600 actively exploited?
Yes. CISA added CVE-2021-22600 to the Known Exploited Vulnerabilities catalog on April 11, 2022, affecting Linux Kernel. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-22600?
CVE-2021-22600 has a CVSS v3 base score of 6.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-22600?
CVE-2021-22600 affects Linux Kernel. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-22600?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22600, 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

Explore the affected products and dependency analysis for CVE-2021-22600

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