CVE-2026-64384 (CVSS 9.8)

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.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.37%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-64384? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64384? +

CVE-2026-64384 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-64384? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-64384