What’s Vulnerable › Vulnerabilities

CVE-2026-64384: smb: client: fix change notify replay double-free

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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 change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_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/145f820dcbb2cced374f2532f8a61a44dce4a615
• https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68
• https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003
• https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6
• https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3

Get alerted when CVE-2026-64384 or the next vulnerability affects your stack