CVE-2026-74406

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().

udp_tunnel_sock_release() could set sk->sk_user_data to NULL while vxlan_gro_prepare_receive() is running.

Let's check if rcu_dereference_sk_user_data() is NULL after skb_gro_remcsum_init().

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). 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

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (6)

Auto-updated Oct 5, 2026
Patch available.
generic

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f79c80f173fda9545b220c1f094b65fc06c252d0
generic

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ef44dac2a37f86eeae6b88ed10a6d60b35387dfd
generic

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9c58c729d32e7cea5772cc44929c6cd61e5a31cd
generic

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4a8cde6f7281ea2c4c290f9ad9923b3631defceb
generic

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/30a45c0bffdd62350261e2f2689fdba426a33578
generic

vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/08f40c0d23c67c3aa4224c3311e134999c721fb4

Vendor Advisories for CVE-2026-74406(1)

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

Patch Availability(5)

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)
  • every version up to 6.1.180-1: fixed in 6.1.180-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.96-1 (31 versions)
  • every version up to 6.12.100-1: fixed in 6.12.100-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (160 versions)
  • every version up to 7.1.5-1: fixed in 7.1.5-1
—

All Vendor Advisories

(5)

Data Freshness Timeline

(refreshed 55× in last 7d / 257× 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 420 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-74406?
CVE-2026-74406 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix potential null-ptr-deref in vxlangroprepare_receive(). udptunnelsockrelease() could set sk->skuser_data to NULL while vxlangroprepare_receive() is running. Let's check if rcudereferenceskuserdata() is NULL after…
When was CVE-2026-74406 disclosed?
CVE-2026-74406 was first published on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74406 actively exploited?
CVE-2026-74406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74406?
CVE-2026-74406 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74406?
A fix for CVE-2026-74406 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74406 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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