CVE-2026-64386
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix query_info() replay double-free
A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_query_info_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
- There is a double-free issue in the query_info() function of the SMB client.
- Who is affected
- Deployments using the SMB client are affected.
- Urgency
- Remediation urgency is unclear due to unknown severity and no exploitation reported.
- Action
- Monitor for updates regarding this issue.
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-2026-64386: In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query_inf…nvd · 2026-07-25
- highCVE-2026-64386: smb: client: fix query_info() replay double-freemsrc · 2026-07-14
External references
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