CVE-2026-23679VulnerabilityPublished 21 May 2026Updated 5 Nov 2026

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Not known to be exploited.

Data as of 5 Nov 2026, 23:17 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

Exploitation evidence

Disclosed: evidence found.
CVE published 21 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Red Hat has released updated RPM packages for Red Hat Hardened Images that fix this vulnerability. Users should apply the update to libusb1 packages as provided in the advisory. No additional mitigations are required beyond applying the official fix.

Description

A vulnerability in libusb allows an attacker to cause a denial of service by providing a specially crafted USB configuration descriptor. This can lead to a null pointer dereference and crash the application using libusb. The flaw can be exploited through virtualized USB passthrough, file-based descriptor parsing, or network sources. The issue affects system availability but does not allow arbitrary code execution. Red Hat has issued an update for Red Hat Hardened Images RPMs to address this issue.

Impact

The vulnerability causes denial of service by crashing applications that use libusb when processing a specially crafted USB configuration descriptor. It affects system availability but does not enable unauthorized code execution, data modification, or disclosure. Exploitation requires local or virtualized USB descriptor input. There are no reports of active exploitation in the wild.

Summary

CVE-2026-23679 is a moderate severity vulnerability in libusb where a malformed USB configuration descriptor can cause a null pointer dereference, resulting in application crashes and denial of service. Exploitation requires an application to process such malformed descriptors, which can occur via virtualized USB passthrough, file parsing, or network sources. The vulnerability impacts availability but does not compromise confidentiality or integrity. Red Hat has released updated RPM packages for Red Hat Hardened Images including libusb1-1.0.30-1.hum1 to fix this issue. The CVSS base score assigned by Red Hat is 6.2 (medium severity) with an availability impact rated high. The vulnerability is tracked under CWE-476 (NULL Pointer Dereference) and CWE-805. No known exploits in the wild have been reported.

CWE-476NULL Pointer Dereference (opens in a new tab)
Base weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #13OWASP Top 10 A10:2025: Mishandling of Exceptional Conditions (opens in a new tab)
The product dereferences a pointer that it expects to be valid but is NULL.
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished.
Requirements
Select a programming language that is not susceptible to these issues.
Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
OWASP Cheat Sheets
Logging (opens in a new tab)
Error Handling (opens in a new tab)
OWASP ASVS 4.0.3
V11.1.7 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-805Buffer Access with Incorrect Length Value (opens in a new tab)
Base weaknessLikelihood of exploit: High
The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overflow Buffers (opens in a new tab)
SOAP Array Overflow (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 5 Nov 2026, 23:17 UTC

WeaknessesCWE-476, CWE-805

Technical details

References

Community reviews

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