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
93%
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) @ focal2026-09-08ubuntu
ubuntulinux-image-lowlatency (5.4.0.100.104) @ focal2026-09-08ubuntu
ubuntulinux-virtual-hwe-20.04 (5.13.0.30.33~20.04.17) @ focal2026-09-08ubuntu
ubuntulinux-headers-5.13.0-30-generic-lpae (5.13.0-30.33) @ impish2026-09-08ubuntu
ubuntulinux-headers-azure-fde (5.4.0.1070.73+cvm1.16) @ focal2026-09-08ubuntu
ubuntulinux-tools-4.15.0-1131-azure (4.15.0-1131.144~16.04.1) @ xenial2026-09-08ubuntu
ubuntulinux-tools-5.4.0-1061-gke (5.4.0-1061.64) @ focal2026-09-08ubuntu

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

(6 across 6 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
linux4.19.118-1 ... 4.19.98-1~bpo9+1 (36 versions)4.19.232-1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.46-4 ... 5.10.92-1~bpo10+1 (6 versions)5.10.92-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.15.15-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.15.15-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.15.15-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
linux-4.194.19.132-1~deb9u1 ... 4.19.208-1~deb9u1 (10 versions)4.19.232-1~deb9u1—

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 96× in last 7d / 417× 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 1,364 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-22600

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