CVE-2026-64387
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix query directory replay double-free
A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_query_directory_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.
CSIRTS triage
- What
- The vulnerability is a double-free issue in the SMB client when querying directories.
- Who is affected
- Deployments using the affected SMB client are at risk.
- Urgency
- Immediate remediation is advised due to the potential for exploitation leading to memory corruption.
- Action
- Apply the fix for the double-free issue in the SMB client.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-64387: In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query dir…nvd · 2026-07-25
- mediumCVE-2026-64387: smb: client: fix query directory replay double-freemsrc · 2026-07-14
External references
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