CVE-2026-64597

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-06. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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 double-free in SMB2_close() replay

A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_close_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
30%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 17, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

smb: client: fix double-free in SMB2_close() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee
generic

smb: client: fix double-free in SMB2_close() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13
generic

smb: client: fix double-free in SMB2_close() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1
generic

smb: client: fix double-free in SMB2_close() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a
generic

smb: client: fix double-free in SMB2_close() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3

Vendor Advisories for CVE-2026-64597(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-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-19ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-19ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-19ubuntu
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-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-19ubuntu
redhatkernel-0:5.14.0-687.46.1.el9_82026-09-10redhat
redhatkernel-0:6.12.0-211.52.1.el10_22026-09-08redhat

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—

Data Freshness Timeline

(refreshed 72× in last 7d / 285× 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 380 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64597?
CVE-2026-64597 is a critical vulnerability published on August 6, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_close() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2closeinit() fails before the next send, cleanup retains the previous buffer type and…
When was CVE-2026-64597 disclosed?
CVE-2026-64597 was first published in the National Vulnerability Database on August 6, 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-2026-64597 actively exploited?
CVE-2026-64597 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 70.3% of all scored CVEs.
What is the CVSS score of CVE-2026-64597?
CVE-2026-64597 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64597?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64597, 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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