Skip to main content
Report · Reddit NetSecAbout CVE-2026-79417Published

CVE-2026-79417: Argus Monitor Local Denial-of-Service Vulnerability

Source Reddit NetSec

0
Compare
Authoritative record:CVE-2026-79417· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium.

Data as of 8 Nov 2026, 23:24 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

AI-suggested

Until an official fix is available, restrict access to the vulnerable IOCTL interface to trusted users only and monitor for attempts to exploit the TOCTOU bug. Avoid running untrusted code with local access that could leverage this vulnerability.

Discussion

CVE-2026-79417 is a local denial-of-service vulnerability in Argus Monitor caused by an exposed IOCTL that allows unprivileged users to disable the x86 MONITOR and MWAIT instructions. Exploiting this vulnerability requires leveraging a time-of-check to time-of-use (TOCTOU) bug related to the SeLocateProcessImageName function. Successful exploitation triggers a HYPERVISOR_ERROR bugcheck, impacting Hyper-V and other kernel components that rely on these instructions.

r/netsec (opens in a new tab)u/p0xq0 points0 comments

(1) An exposed IOCTL lets unprivileged users disable the x86 MONITOR & MWAIT instructions used by Hyper-V and other kernel components--triggering a HYPERVISOR_ERROR bugcheck.

(2) Reaching the IOCTL requires exploiting a TOCTOU bug arguably caused by poor documentation of the SeLocateProcessImageName function.

(3) Reimplementation of the driver's security through obscurity IOCTL encryption scheme: SHA-256 KDF-derived XOR keystream & CRC16 Checksum.

See full write-up, and Github for PoC.

References

Community reviews

Loading reviews…