Incident Score: Analysis & Impact (AMDLIN1783614518)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of AMD'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 AMD 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 AMD breach identified under incident ID AMDLIN1783614518.
The analysis begins with a detailed overview of AMD's information like the linkedin page: https://www.linkedin.com/company/amd, the number of followers: 2368732, the industry type: Semiconductor Manufacturing and the number of employees: 47977 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 779 and after the incident was 778 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 AMD and their customers.
On 12 April 2026, Linux Kernel disclosed Privilege Escalation issues under the banner "Linux Kernel Privilege Escalation Flaw (CVE-2026-46215)".
A critical use-after-free vulnerability in the Linux kernel, tracked as CVE-2026-46215, allowed local users with GPU render node access to escalate privileges to root without special permissions.
The disruption is felt across the environment, affecting Linux kernels v6.18-rc1 to v6.18.31, v7.0.0 to v7.0.8.
In response, moved swiftly to contain the threat with measures like Patch released in kernel versions 6.18.32, 7.0.9, and 7.1-rc3 onward, and began remediation that includes Two-stage idr_replace operation to close the race window; GEM_CHANGE_HANDLE ioctl disabled in 7.1 release.
The case underscores how Resolved, teams are taking away lessons such as The vulnerability highlights recurring issues in kernel development: compound operations on refcounted objects where references are added, removed, and counted in separate steps, leaving gaps for concurrent teardown to free memory still in use. Subsystems bypassing established helper functions remain at risk for similar race conditions, and recommending next steps like Apply patches to kernel versions 6.18.32, 7.0.9, or 7.1-rc3 onward. Disable the GEM_CHANGE_HANDLE ioctl in future releases. Review kernel subsystems for similar race conditions in refcounted object operations.
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 critical use-after-free vulnerability...allowed local users...to escalate privileges to root and Abuse Elevation Control Mechanism: Setuid and Setgid (T1548.001) with moderate to high confidence (80%), supported by evidence indicating /etc/passwd overwrite via page cache, removing root’s password field. Under the Initial Access tactic, the analysis identified Valid Accounts (T1078) with high confidence (90%), supported by evidence indicating any process with access to /dev/dri/renderD* granted by default to logged-in users. Under the Defense Evasion tactic, the analysis identified Indicator Removal (T1066) with moderate to high confidence (70%), supported by evidence indicating removing root’s password field via /etc/passwd overwrite and Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (60%), supported by evidence indicating pIPE_BUF_FLAG_CAN_MERGE manipulation to circumvent the 2022 DirtyPipe fix. Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with moderate to high confidence (85%), supported by evidence indicating exploit succeeded in 99 out of 100 test boots, requiring fewer than 100 race iterations. Under the Discovery tactic, the analysis identified System Information Discovery (T1082) with moderate to high confidence (70%), supported by evidence indicating kernel pointer leak to bypass KASLR. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- AMD Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/amd/incident/AMDLIN1783614518
- AMD CyberSecurity Rating page: https://www.rankiteo.com/company/amd
- AMD Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/amdlin1783614518-amd-linux-kernel-vulnerability-april-2026/
- AMD CyberSecurity Score History: https://www.rankiteo.com/company/amd/history
- AMD CyberSecurity Incident Source: https://cybersecuritynews.com/linux-kernel-bug-passwordless-root/
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf