CVE-2026-64383 remediation guide
Linux
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful req...
A verified fixed-version field is not available. Use the linked NVD and supporting references, then confirm the vendor-supported path before changing production systems.
Identify the affected asset
Confirm whether Linux is installed, record the deployed version and installation path, and identify exposed interfaces.
- Record the product name, package or appliance identifier, and installed version.
- Identify internet-facing, administrative, API, and internal access paths.
- Preserve the pre-change configuration and relevant service logs.
Validate the affected-version match
Compare the deployed version with the affected range: >= 433042a91f9373241307725b52de573933ffedbf < 6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 878757163eea684750107a31ea134c103863515d, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 3407240cde132a4b72d6429a2625a09a2f78adaf, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 013a9a3da46c5dabcf18f65ea6a47874ba12a15d, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a, >= 6.6.32 < 6.6.145, >= 6.8. Treat incomplete inventory results as unresolved.
Prioritize with independent signals
The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.
Apply supported remediation
Follow the vendor advisory or supported update path. Current fixed-version status: No verified fixed-version field is available yet. Preserve configuration and rollback material before change.
Verify the result
Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.
- Confirm the expected version and package state.
- Run a functional health check for critical service paths.
- Review authentication, error, application, and security monitoring logs.
- Reassess exposure if the supported fix cannot be applied.
Operational boundary
This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.