CVE-2026-64382

smb: client: fix double-free in SMB2_open() replay

HIGH
8.8
CVSS Score
Published: July 25, 2026 at 08:50 AM UTC
Updated: October 19, 2026 at 09:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_open() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_open_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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

6.13 ≤ v < 6.18.396.19 ≤ v < 7.1.46.6.32 ≤ v < 6.6.1456.8.1 ≤ v < 6.12.96433042a91f9373241307725b52de573933ffedbf4f1fffa2376922f3d1d506e49c0fd445b023a28e6.6.326.86.8 rc26.8 rc36.8 rc46.8 rc56.8 rc66.8 rc7
Vendor states this is fixed in 02bc2896bdc3e29362d6e40d404006944a159c25 (fixed)
Vendor states this is fixed in 14498ff5ce0f272ce0ef988721413e06b7038972 (fixed)
Vendor states this is fixed in 3196b5192f246df4272072f61a2f4a3e9967f55d (fixed)
Vendor states this is fixed in b55e182f2324bc6a604c21a47aa6c448f719a532 (fixed)
Vendor states this is fixed in ff2d30927bc3bf3c629f0768d2068096e64ef5ce (fixed)
Vendor states this is fixed in 6.12.96 (unaffected)
Vendor states this is fixed in 6.18.39 (unaffected)
Vendor states this is fixed in 6.6.145 (unaffected)
Vendor states this is fixed in 6.8 (unaffected)
Vendor states this is fixed in 7.1.4 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-415

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