CVE-2026-64383

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 double-free in SMB2_flush() replay

SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time.

Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.

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 double-free in SMB2_flush() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d
generic

smb: client: fix double-free in SMB2_flush() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb
generic

smb: client: fix double-free in SMB2_flush() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a
generic

smb: client: fix double-free in SMB2_flush() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adaf
generic

smb: client: fix double-free in SMB2_flush() replay - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15d

Vendor Advisories for CVE-2026-64383(2)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-09-20ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-20ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-31.31~24.04.1) @ noble2026-09-20ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-20ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-20ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-20ubuntu

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 54× in last 7d / 249× 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. 2026-09-20 01:25 UTCEG score recompute
  2. 2026-09-20 01:25 UTCVendor advisory
  3. 2026-09-20 01:25 UTCGHSA enrichment
  4. 2026-09-18 23:24 UTCVendor advisory
  5. 2026-09-18 23:23 UTCGHSA enrichment
  6. 2026-09-18 19:47 UTCEG score recompute
  7. 2026-09-18 19:47 UTCVendor advisory
  8. 2026-09-18 19:47 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 10:03 UTCVendor advisory
  11. 2026-09-18 10:03 UTCGHSA enrichment
  12. 2026-09-18 06:26 UTCVendor advisory
  13. 2026-09-18 06:26 UTCGHSA enrichment
  14. 2026-09-18 02:46 UTCEG score recompute
  15. 2026-09-18 02:46 UTCVendor advisory
  16. 2026-09-18 02:46 UTCGHSA enrichment
  17. 2026-09-17 09:11 UTCVendor advisory
  18. 2026-09-17 09:11 UTCGHSA enrichment
  19. 2026-09-17 05:32 UTCVendor advisory
  20. 2026-09-17 05:32 UTCGHSA enrichment
  21. 2026-09-17 01:54 UTCEG score recompute
  22. 2026-09-17 01:54 UTCVendor advisory
  23. 2026-09-17 01:54 UTCGHSA enrichment
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 11:56 UTCVendor advisory
Show 75 more
  1. 2026-09-16 11:56 UTCGHSA enrichment
  2. 2026-09-16 06:29 UTCEG score recompute
  3. 2026-09-16 06:29 UTCVendor advisory
  4. 2026-09-16 06:29 UTCGHSA enrichment
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-15 09:23 UTCEG score recompute
  7. 2026-09-15 09:23 UTCVendor advisory
  8. 2026-09-15 09:23 UTCGHSA enrichment
  9. 2026-09-14 15:53 UTCVendor advisory
  10. 2026-09-14 15:53 UTCGHSA enrichment
  11. 2026-09-14 12:08 UTCVendor advisory
  12. 2026-09-14 12:08 UTCGHSA enrichment
  13. 2026-09-14 08:27 UTCVendor advisory
  14. 2026-09-14 08:27 UTCGHSA enrichment
  15. 2026-09-14 04:47 UTCVendor advisory
  16. 2026-09-14 04:47 UTCGHSA enrichment
  17. 2026-09-14 01:10 UTCVendor advisory
  18. 2026-09-14 01:10 UTCGHSA enrichment
  19. 2026-09-13 21:32 UTCEG score recompute
  20. 2026-09-13 21:32 UTCVendor advisory
  21. 2026-09-13 21:32 UTCGHSA enrichment
  22. 2026-09-13 15:23 UTCVendor advisory
  23. 2026-09-13 15:23 UTCGHSA enrichment
  24. 2026-09-13 11:11 UTCVendor advisory
  25. 2026-09-13 11:11 UTCGHSA enrichment
  26. 2026-09-13 07:27 UTCVendor advisory
  27. 2026-09-13 07:27 UTCGHSA enrichment
  28. 2026-09-13 03:50 UTCVendor advisory
  29. 2026-09-13 03:50 UTCGHSA enrichment
  30. 2026-09-13 00:09 UTCVendor advisory
  31. 2026-09-13 00:09 UTCGHSA enrichment
  32. 2026-09-12 20:12 UTCVendor advisory
  33. 2026-09-12 20:12 UTCGHSA enrichment
  34. 2026-09-12 16:34 UTCEG score recompute
  35. 2026-09-12 16:34 UTCVendor advisory
  36. 2026-09-12 16:34 UTCGHSA enrichment
  37. 2026-09-12 12:51 UTCVendor advisory
  38. 2026-09-12 12:50 UTCGHSA enrichment
  39. 2026-09-12 09:13 UTCVendor advisory
  40. 2026-09-12 09:13 UTCGHSA enrichment
  41. 2026-09-12 04:59 UTCVendor advisory
  42. 2026-09-12 04:59 UTCGHSA enrichment
  43. 2026-09-12 00:47 UTCVendor advisory
  44. 2026-09-12 00:47 UTCGHSA enrichment
  45. 2026-09-11 20:27 UTCVendor advisory
  46. 2026-09-11 20:27 UTCGHSA enrichment
  47. 2026-09-11 16:23 UTCEG score recompute
  48. 2026-09-11 16:23 UTCVendor advisory
  49. 2026-09-11 16:23 UTCGHSA enrichment
  50. 2026-09-11 14:53 UTCEPSS rescore
  51. 2026-09-11 09:37 UTCEPSS rescore
  52. 2026-09-11 07:10 UTCVendor advisory
  53. 2026-09-11 07:10 UTCGHSA enrichment
  54. 2026-09-11 02:15 UTCVendor advisory
  55. 2026-09-11 02:15 UTCGHSA enrichment
  56. 2026-09-10 20:52 UTCVendor advisory
  57. 2026-09-10 20:52 UTCGHSA enrichment
  58. 2026-09-10 13:19 UTCEG score recompute
  59. 2026-09-10 13:19 UTCVendor advisory
  60. 2026-09-10 13:19 UTCGHSA enrichment
  61. 2026-09-09 12:18 UTCVendor advisory
  62. 2026-09-09 12:18 UTCGHSA enrichment
  63. 2026-09-09 08:36 UTCEG score recompute
  64. 2026-09-09 08:36 UTCVendor advisory
  65. 2026-09-09 08:36 UTCGHSA enrichment
  66. 2026-09-08 22:01 UTCEPSS rescore
  67. 2026-09-08 00:52 UTCVendor advisory
  68. 2026-09-08 00:52 UTCGHSA enrichment
  69. 2026-09-07 21:15 UTCEG score recompute
  70. 2026-09-07 21:15 UTCVendor advisory
  71. 2026-09-07 21:15 UTCGHSA enrichment
  72. 2026-09-07 16:01 UTCEPSS rescore
  73. 2026-09-06 15:42 UTCEG score recompute
  74. 2026-09-06 15:42 UTCVendor advisory
  75. 2026-09-06 15:41 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64383?
CVE-2026-64383 is a critical vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifssendrecv() stores a…
When was CVE-2026-64383 disclosed?
CVE-2026-64383 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-2026-64383 actively exploited?
CVE-2026-64383 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 61.0% of all scored CVEs.
What is the CVSS score of CVE-2026-64383?
CVE-2026-64383 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-64383?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64383, 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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