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CVE-2026-64597: smb: client: fix double-free in SMB2_close() replay

• Severity: critical (CVSS 9.8 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: 2026-08-06 · 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_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.

Affected products

• Linux kernel: from 6.6.32 before 6.6.145; 6.8 — fixed in 6.6.145, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.6.145, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3
• https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a
• https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1
• https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13
• https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee

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