CVE-2026-64137

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

smb: client: require net admin for CIFS SWN netlink

CIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command. The intended sender is the cifs.witness helper, but the generic-netlink operation currently has no capability flag, so any local process can send RESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness handler.

The same family exposes CIFS_GENL_MCGRP_SWN without multicast-group capability flags. Register messages sent to that group include the witness registration id and, for NTLM-authenticated mounts, the username, domain, and password attributes copied from the CIFS session. An unprivileged local process should not be able to join that group and receive those messages.

Require CAP_NET_ADMIN for incoming SWN_NOTIFY commands with GENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for joining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN. The cifs.witness service runs with the privileges needed for both operations.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 13, 2026

Advisory Details (7)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b
generic

smb: client: require net admin for CIFS SWN netlink - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95

Vendor Advisories for CVE-2026-64137(1)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-18ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-18ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-09-18ubuntu
ubuntulinux-virtual-6.8 (6.8.0-139.139) @ noble2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1067.75) @ noble2026-09-18ubuntu

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 rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (141 versions)7.0.12-1—

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 17× in last 7d / 96× 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 269 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64137?
CVE-2026-64137 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: require net admin for CIFS SWN netlink CIFSGENLCMDSWNNOTIFY is the userspace witness-notify command. The intended sender is the cifs.witness helper, but the generic-netlink operation currently has no capability flag,…
When was CVE-2026-64137 disclosed?
CVE-2026-64137 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64137 actively exploited?
CVE-2026-64137 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-64137?
CVE-2026-64137 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-64137?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64137, 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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