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Analyze » Linux Kernel Security » SUSLIN1789453827

Incident Score: Analysis & Impact (SUSLIN1789453827)

The details regarding individual company incidents & reports gives you full view from every side.

Rankiteo Score Impact Analysis

Rankiteo Incident Impact-1
Company Score Before Incident747 / 1000
Company Score After Incident746 / 1000
Company LinkView Linux Kernel Security Profile
INCIDENT NUMBERSUSLIN1789453827
Type of Cyber IncidentVulnerability
ATTACK VECTORLocal Access
DATA EXPOSEDNA
INCIDENT DATE31/12/2025
STATUSpublished

Key Highlights From The Incident Analysis

  • Timeline of Linux Kernel Security's Vulnerability and lateral movement inside company's environment.
  • Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
  • How Rankiteo’s incident engine converts technical details into a normalized incident score.
  • How this cyber incident impacts Linux Kernel Security Rankiteo cyber scoring and cyber rating.
  • Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.

Full Incident Analysis Transcript

In this Rankiteo incident briefing, we review the Linux Kernel Security breach identified under incident ID SUSLIN1789453827.

The analysis begins with a detailed overview of Linux Kernel Security's information like the linkedin page: https://www.linkedin.com/company/linkersec, the number of followers: 811, the industry type: Computer and Network Security and the number of employees: 1 employees

After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 747 and after the incident was 746 with a difference of -1 which is could be a good indicator of the severity and impact of the incident.

In the next step of the video, we will analyze in more details the incident and the impact it had on Linux Kernel Security and their customers.

A newly reported cybersecurity incident, "Linux Kernel 'ZcopyReaper' Vulnerability (CVE-2026-43502) Exposes Systems to Local Privilege Escalation", has drawn attention.

A newly disclosed Linux kernel vulnerability, CVE-2026-43502 (dubbed *ZcopyReaper*), allows unprivileged local users to escalate privileges on vulnerable systems under specific conditions.

The disruption is felt across the environment, affecting Linux systems with RDS networking support enabled (RDS over TCP, CONFIG_RDS_TCP, CONFIG_INET, CONFIG_AIO, CONFIG_RDS).

In response, moved swiftly to contain the threat with measures like Update to a patched kernel or disable RDS functionality where unnecessary, and began remediation that includes Apply kernel patches provided by distribution vendors.

The case underscores how and recommending next steps like Monitor distribution advisories for patched kernel versions, test disabling RDS functionality if unnecessary, and apply updates promptly.

Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.

The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.

MITRE ATT&CK® Correlation Analysis

Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Privilege Escalation tactic, the analysis identified Exploitation for Privilege Escalation (T1068) with high confidence (95%), supported by evidence indicating cVE-2026-43502 (ZcopyReaper) allows unprivileged local users to escalate privileges. Under the Initial Access tactic, the analysis identified Valid Accounts (T1078) with moderate to high confidence (80%), supported by evidence indicating exploitation requires local access but no elevated permissions. Under the Defense Evasion tactic, the analysis identified Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (60%), supported by evidence indicating disabling unprivileged user namespaces does not mitigate this flaw. Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with moderate to high confidence (70%), supported by evidence indicating vulnerability in RDS zerocopy send path enables local privilege escalation. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.

Privilege Escalation
Exploitation for Privilege Escalation (95%)
Initial Access
Valid Accounts (80%)
Defense Evasion
Impair Defenses: Disable or Modify Tools (60%)
Execution
Exploitation for Client Execution (70%)

Sources & References