CVE-2026-64384

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-25. 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%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

smb: client: fix change notify replay double-free

A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_init() fails before the next send, cleanup retains the previous buffer type and frees that response again.

Reset response bookkeeping before each attempt to prevent the stale free.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 25, 2026

Last Modified

August 17, 2026

Advisory Details (5)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

smb: client: fix change notify replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3
generic

smb: client: fix change notify replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6
generic

smb: client: fix change notify replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003
generic

smb: client: fix change notify replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68
generic

smb: client: fix change notify replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/145f820dcbb2cced374f2532f8a61a44dce4a615

Vendor Advisories for CVE-2026-64384(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux-6.126.12.100-1~deb12u1
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)6.12.96-1
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (156 versions)7.1.4-1

Data Freshness Timeline

(refreshed 68× in last 7d / 326× 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 373 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64384?
CVE-2026-64384 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2notifyinit() fails before the next send, cleanup retains the previous buffer type and…
When was CVE-2026-64384 disclosed?
CVE-2026-64384 was first published in the National Vulnerability Database on July 25, 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-2026-64384 actively exploited?
CVE-2026-64384 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 62.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64384?
CVE-2026-64384 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64384?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64384, 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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