CVE-2026-64387 | In the Linux kernel, the following vulnerability has been re… | CVSS 9.8 CRITICAL

Description

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.

Metadata

CVE ID: CVE-2026-64387
State: PUBLISHED
Assigner: Linux
Reserved: 2026-07-19 15:36 UTC
Published: 2026-07-25 08:50 UTC
Last updated: 2026-07-27 05:00 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	433042a91f9373241307725b52de573933ffedbf < 3409aedf3c81a810243da94164f6621c9d205c98, 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 1665f25b1dea30bf2d02e16245d203a944c9d994, 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 00b0fa425941438b664950a8ee65dfba2def4336, 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 3317a5d015fca976475aa71df224056777316fde …
Linux	Linux	—	6.8, 0 < 6.8, 6.6.145 ≤ 6.6., 6.12.96 ≤ 6.12. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (5)