{"uuid": "7d5c28a6-89fa-4eeb-9f90-e1ed238984b4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2019-18683", "type": "seen", "source": "https://t.me/hacking_Attack/13404", "content": "Q: Why enabling CONFIG_STATIC_USERMODEHELPER breaks various things in my GNU/Linux system?  Do I really need that feature?  A: Linux kernel usermode helpers can be used for privilege escalation (https://www.kitploit.com/search/label/Privilege%20Escalation) in kernel exploits  (example 1 (https://googleprojectzero.blogspot.com/2018/09/a-cache-invalidation-bug-in-linux.html), example 2 (https://a13xp0p0v.github.io/2020/02/15/CVE-2019-18683.html)). CONFIG_STATIC_USERMODEHELPER prevents that method. But it  requires the corresponding support in the userspace: see the example implementation (https://github.com/tych0/huldufolk) by  Tycho Andersen @tych0 (https://github.com/tych0).  \n  Q: Does my kernel have all those mitigations of Transient Execution Vulnerabilities in my hardware?  A: Checking the kernel config is not enough to answer this question.  I highly recommend using spectre-meltdown-checker (https://github.com/speed47/spectre-meltdown-checker) tool maintained by St\u00e9phane Lesimple @speed47 (https://github.com/speed47).  \n\nDownload Kconfig-Hardened-Check (https://github.com/a13xp0p0v/kconfig-hardened-check)\n\n___________________________ \n@hacking_Attack\n@Hacking_Video", "creation_timestamp": "2026-09-01T20:02:35.225589Z"}