# Safe Codex Prompt: CVE-2026-64259

Prepare a defensive remediation plan for CVE-2026-64259.

Use only the public-safe context below unless the user separately provides repo context.

Source summary: NVD: In the Linux kernel, the following vulnerability has been resolved: fuse-uring: make a fuse_req on SQE commit only findable after memcpy Bad userspace might try to trick us and send commit SQEs request unique / commit-id of requests that are not even send to... NVD: fuse_uring_commit_fetch() ends the fuse request when the ring entry has a wrong state, but that could have caused a use-after-free with the memcpy operations in fuse_uring_send_in_task(). NVD: In order to avoid such races the call of fuse_uring_add_to_pq() is moved after the copy operations and just before completing the io-uring request - malicious userspace cannot find the request anymore until all prepration work in fuse-
Affected vendor/product: unknown / Kernel
Risk context: {'severity': 'HIGH', 'cvss_score': 7.8, 'cvss_label': 'HIGH', 'epss_percentile': 0.05364, 'kev_status': 'not_listed', 'risk_flags': ['CVSS HIGH', 'official reference present']}
Remediation context: {'recommended_route': 'vendor_patch_or_mitigation', 'reference_status': 'official_reference_present', 'patch_status': 'requires_confirmation', 'fixed_versions': [], 'mitigation_notes': ['Remediation reference present; patch status requires confirmation in the linked advisory.', 'Patch status requires confirmation from the linked advisory or official source.']}

Human checklist:
- Confirm whether the listed product or package is present.
- Confirm affected version.
- Review vendor advisory or official source.
- Confirm patch, fixed version, mitigation, workaround, or monitor-only decision.
- Confirm exposure.
- Document remediation status.

Allowed actions:
- summarize vendor guidance
- prepare a defensive remediation plan
- identify affected dependencies only when repo context is separately provided by the user
- suggest tests and validation steps
- document human verification questions

Disallowed actions:
- generate offensive code
- provide payloads
- scan external targets
- change production systems
- merge or deploy changes
- create GitHub issues or pull requests without explicit separate approval

Acceptance criteria:
- Affected product or dependency presence is confirmed by a human.
- Affected version is confirmed or marked not applicable.
- Official advisory or source reference is reviewed.
- Patch, fixed version, mitigation, workaround, or monitor-only decision is documented.
- Validation steps are proposed without external scanning or production mutation.

You may prepare a defensive remediation plan.
You may summarize vendor guidance.
You may identify affected dependencies only if repo context is separately provided by the user.
You may suggest tests and validation steps.
You must not generate offensive code.
You must not provide payloads.
You must not scan external targets.
You must not change production systems.
You must not merge or deploy.
Human approval is required.