0xBlackash/CVE-2026-64600

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PoC files

2 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

The artifact is a Bash script that checks a Linux system for exposure to CVE-2026-64600 by inspecting the kernel version, mounted XFS filesystems with reflink enabled, and kernel symbols. It does not exploit the vulnerability; it only reports potential vulnerability status.

Backdoor review

No backdoor observed in reviewed code

The repository contains a README and a shell script. The script performs read-only system checks (kernel version, XFS filesystem status, patch detection) to assess vulnerability to CVE-2026-64600. No backdoor, deceptive payload, or harmful behavior is observed.

ClassificationScanner
Model confidence95%
AuthenticationNot required
LanguagesShell
Target softwareLinux Kernel
Attack typesvulnerability_scanner
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The script performs read-only system checks (kernel version, filesystem mount options, kernel symbols) to determine if a system is potentially vulnerable to CVE-2026-64600. It does not contain any code to trigger, exploit, or exercise the vulnerability. The README describes the vulnerability but provides no exploit code. This matches the definition of a scanner.

CVE-2026-64600.sh:3-4CVE-2026-64600.sh:16-80README.md:1-113

Requirements

  • Local shell access on a Linux systemCVE-2026-64600.sh:1

Observed behavior

  • Checks kernel version and flags older kernels as potentially vulnerableCVE-2026-64600.sh:16-27
  • Enumerates mounted XFS filesystems and checks if reflink is enabledCVE-2026-64600.sh:30-51
  • Searches /proc/kallsyms and kernel config for XFS reflink symbols to detect patchesCVE-2026-64600.sh:54-68
  • Outputs a final verdict of vulnerable or not vulnerable based on checksCVE-2026-64600.sh:71-80
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Script Behavior
Read-only system information gatheringThe script uses uname, findmnt, xfs_info, grep on /proc/kallsyms and /boot/config to check for vulnerability indicators without modifying the system.CVE-2026-64600.sh:17-18CVE-2026-64600.sh:34CVE-2026-64600.sh:44CVE-2026-64600.sh:55-60
Discrepancy
README mentions 'RefluxFS filesystem implementation' but CVE description and script reference XFS reflinkThe README incorrectly names the affected component as 'RefluxFS' while the actual vulnerability is in XFS reflink code. This appears to be a documentation error rather than malicious intent.README.md:22CVE-2026-64600.sh:3
Review boundaries

What the analysis did not establish

  • Only the provided text files (CVE-2026-64600.sh and README.md) were analyzed; no other files from the repository were inspected.
  • The script's patch detection logic is heuristic and may produce false positives or negatives.
  • Only the two text files in the repository were reviewed; no binary files were present or analyzed.
  • The review does not verify the accuracy of the vulnerability assessment or the safety of the recommended update commands.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1