0xBlackash/CVE-2026-46242

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PoC files

2 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A self-contained C exploit for CVE-2026-46242 that attempts to trigger a use-after-free race condition in the Linux kernel's eventpoll subsystem and escalate privileges to root.

Backdoor review

No backdoor observed in reviewed code

The repository contains a README describing CVE-2026-46242 and a C source file implementing a local privilege escalation exploit for the vulnerability. The exploit code performs standard race-condition triggering, heap spraying, and a privilege check, consistent with a proof-of-concept for the stated CVE. No concealed backdoor, credential theft, persistence mechanism, or unrelated payload is present in the reviewed text.

ClassificationExploit
Model confidence95%
AuthenticationRequired
LanguagesC
Target softwareLinux Kernel
Attack typesUse-After-FreeRace ConditionLocal Privilege Escalation
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The C file is a complete, self-contained program that actively attempts to trigger a vulnerability and escalate privileges, which is the definition of an exploit. The code includes a racer thread, a trigger loop, and a post-exploit check for root access followed by a shell execution.

CVE-2026-46242.c:2-8CVE-2026-46242.c:34-45CVE-2026-46242.c:80-88CVE-2026-46242.c:101-108

Requirements

  • Local access to a vulnerable Linux kernel version (5.15.209 to <5.16, 6.1.175 to <6.2, 6.4 to <6.18.33, 6.19 to <7.0.10).README.md:81-87
  • Low-privileged user account on the target system.README.md:44

Observed behavior

  • Creates multiple interconnected epoll file descriptors to set up mutual watching.CVE-2026-46242.c:60-70
  • Spawns a racer thread that repeatedly closes and recreates epoll file descriptors to trigger a race condition.CVE-2026-46242.c:34-45
  • The main thread closes and recreates specific epoll file descriptors in a loop to trigger the use-after-free.CVE-2026-46242.c:80-88
  • After the race, attempts to check for root privileges and spawn a root shell if successful.CVE-2026-46242.c:101-108
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Exploit Behavior
Race condition trigger via multithreaded epoll close/create loopsThe C code creates epoll instances, sets up mutual watching, and uses a racer thread to close and recreate epoll file descriptors while the main thread also closes and recreates them, aiming to trigger the UAF described in CVE-2026-46242.CVE-2026-46242.c:34-45CVE-2026-46242.c:80-88
Privilege Escalation Attempt
Check for root UID and spawn shell if successfulAfter the race, the code checks if getuid() == 0 and executes /bin/sh, which is the standard goal of a local privilege escalation exploit.CVE-2026-46242.c:102-105
Disclaimer
README states no exploit code or offensive tooling is includedThe README claims the repository is for educational and defensive purposes and does not contain exploit code, which contradicts the presence of CVE-2026-46242.c. This is a factual inaccuracy but does not constitute backdoor behavior.README.md:198-200
Review boundaries

What the analysis did not establish

  • The README.md states 'It does not contain exploit code or offensive tooling' (line 200), which contradicts the presence of CVE-2026-46242.c, a full exploit.
  • The exploit's effectiveness is not verified; the code includes a failure message indicating the race may be missed or the kernel patched (line 106).
  • The exploit relies on a race condition and may not succeed reliably.
  • Only the two text files (CVE-2026-46242.c and README.md) were reviewed; no binary files were present or analyzed.
  • The review is based solely on static source code analysis; runtime behavior or potential compiler-introduced effects are not evaluated.
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