CVE-2026-64535 remediation guide
Linux
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Fix potential UAF when ddgst mismatch Shivam Kumar found via vulnerability testing: When data digest is enabled on an NVMe/TCP connection and a digest mismatch occurs on a non-final H2C_DATA PDU during an R2T-based data transfer, the digest error handler in nvmet_tcp_try_recv_ddgst() calls nvmet_req_uninit() — which performs percpu_ref_put() on the submission queue — but does NOT mark the command as completed. It does not set cqe->status, does not modify rbytes_done, and does not clear any flag. When the subseque...
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: >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 96fe2513df590e74b04253a45089cae75569570e, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e091ff83d962f9ed00d9bd70443676de9fe98bdc, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6f9442983a3e4227afd1c83a5251ddbca585ea21, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 088ee46c18d99baef453afd74181dd40ade044ad, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < dbbd07d0a7020b80f6a7028e561908f7b83b3d5a, < 6.1.178, < 6.6.145, < 6.12.97, < 6.18.40. 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.