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CVE-2026-64382: smb: client: fix double-free in SMB2_open() replay

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-10-19
• Weakness: CWE-415

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 products

• Linux kernel: from 6.6.32 before 6.6.145; from 6.8.1 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 6.8, 6.8-rc2, 6.8-rc3, 6.8-rc4, 6.8-rc5, 6.8-rc6 (+1) — fixed in 6.12.96, 6.18.39, 6.6.145, 7.1.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.96, 6.18.39, 6.6.145, 7.1.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/02bc2896bdc3e29362d6e40d404006944a159c25
• https://git.kernel.org/stable/c/14498ff5ce0f272ce0ef988721413e06b7038972
• https://git.kernel.org/stable/c/3196b5192f246df4272072f61a2f4a3e9967f55d
• https://git.kernel.org/stable/c/b55e182f2324bc6a604c21a47aa6c448f719a532
• https://git.kernel.org/stable/c/ff2d30927bc3bf3c629f0768d2068096e64ef5ce

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