CVE-2026-64387

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 — Patch released 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

A fix is available — apply it.

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

smb: client: fix query directory replay double-free

A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_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
39%
KEV
Not listed

Published

July 25, 2026

Last Modified

September 4, 2026

Advisory Details (5)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

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

https://git.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7
generic

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

https://git.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98
generic

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

https://git.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fde
generic

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

https://git.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994
generic

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

https://git.kernel.org/stable/c/00b0fa425941438b664950a8ee65dfba2def4336

Vendor Advisories for CVE-2026-64387(6)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-19ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-19ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-19ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-09-19ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-19ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-19ubuntu
redhatkernel-0:5.14.0-570.141.1.el9_62026-09-16redhat
redhatkernel-0:6.12.0-55.104.1.el10_02026-09-14redhat
redhatkernel-0:5.14.0-687.44.1.el9_82026-09-04redhat
redhatkernel-0:6.12.0-211.51.1.el10_22026-09-04redhat

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
linux-6.12—6.12.100-1~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 (158 versions)7.1.4-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 58× in last 7d / 251× 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 533 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64387?
CVE-2026-64387 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2querydirectory_init() fails before the next send, cleanup retains the previous buffer…
When was CVE-2026-64387 disclosed?
CVE-2026-64387 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64387 actively exploited?
CVE-2026-64387 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 61.1% of all scored CVEs.
What is the CVSS score of CVE-2026-64387?
CVE-2026-64387 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64387?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64387, 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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