CVE-2026-64385
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix double-free in SMB2_ioctl() replay
A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_ioctl_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
- A double-free vulnerability exists in the SMB2_ioctl() function during replay operations.
- Who is affected
- Deployments of the Linux kernel with SMB2 support.
- Urgency
- Remediation is necessary to prevent potential exploitation, though no active exploits are reported.
- Action
- Apply the latest kernel patches that address 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-2026-64385: In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-fr…nvd · 2026-07-25
- highCVE-2026-64385: smb: client: fix double-free in SMB2_ioctl() replaymsrc · 2026-07-14
External references
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