Cve 2026 46243 Cifswitch

Automated detection and remediation auditing for the CVE-2026-46243 "CIFSwitch" Linux privilege escalation vulnerability.

Install
cmdop skills install agensi-cve-2026-46243-cifswitch

This skill automates detection and remediation auditing for CVE-2026-46243, a high-severity Local Privilege Escalation (LPE) flaw affecting Linux systems that use CIFS and cifs-utils. It performs multi-stage heuristic analysis without modifying the target system.

The skill checks kernel patching status by scanning for unpatched versions and inspecting /proc/kallsyms for the fix symbol cifs_spnego_key_vet_description. It audits userspace components to determine whether cifs-utils 6.14 or later is present and whether the rootful cifs.upcall helper is exposed. It maps attack paths by evaluating whether cifs.spnego request-key rules are active and whether the CIFS kernel module is loadable. Mitigation analysis covers the status of unprivileged user namespaces, SELinux and AppArmor policies, and container capabilities.

Outputs are delivered as either a structured JSON report or a human-readable diagnostic, each stating a definitive VULNERABLE or MITIGATED verdict alongside specific remediation commands. Exit codes are CI/CD-ready, enabling automated deployment gating or cluster-wide programmatic auditing.

This skill is useful because identifying this CVE manually requires correlating kernel patch levels with specific userspace utility versions and active request-key configurations simultaneously — a correlation that is easy to get wrong without dedicated tooling.

Use cases

  • Audit a Linux host for CVE-2026-46243 exposure before promoting a container image to production
  • Gate CI/CD pipeline deployments based on CIFSwitch vulnerability status using the skill's exit codes
  • Scan an entire cluster of Linux nodes programmatically for CIFS-related LPE exposure
  • Verify that a kernel patch or cifs-utils upgrade has resolved CVE-2026-46243 on a specific host
  • Check whether SELinux, AppArmor, or namespace restrictions are actively mitigating the vulnerability
  • Generate a structured JSON audit report of CIFSwitch vulnerability conditions for compliance records

When to use it

  • Target systems run Linux with CIFS or cifs-utils installed
  • A read-only, non-invasive audit of kernel and userspace components is required
  • CI/CD pipelines need automated, exit-code-driven vulnerability gating
  • Remediation verification is needed after patching cifs-utils or the kernel

When not to use it

  • The target system does not use CIFS or cifs-utils — the checks are specific to this attack surface
  • A broad CVE scanner covering multiple vulnerability classes is needed rather than a single-CVE skill
  • The environment runs non-Linux operating systems
  • Active exploitation or penetration testing is the goal — this skill is read-only and diagnostic only