CVE-2026-64386

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

A fix is available — apply it.

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

smb: client: fix query_info() replay double-free

A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_info_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_info() replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfca
generic

smb: client: fix query_info() replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364
generic

smb: client: fix query_info() replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db
generic

smb: client: fix query_info() replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e
generic

smb: client: fix query_info() replay double-free - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4

Vendor Advisories for CVE-2026-64386(4)

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-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-09-18ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-18ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-18ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-18ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
redhatkernel-0:5.14.0-687.41.1.el9_82026-08-20redhat
redhatkernel-0:6.12.0-211.49.1.el10_22026-08-20redhat

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 60× in last 7d / 263× 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 549 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64386?
CVE-2026-64386 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query_info() replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2queryinfo_init() fails before the next send, cleanup retains the previous buffer type…
When was CVE-2026-64386 disclosed?
CVE-2026-64386 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-2026-64386 actively exploited?
CVE-2026-64386 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-2026-64386?
CVE-2026-64386 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64386?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64386, 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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