// For flags

NotCVE-2024-0002

AMD Bulldozer Linux ASLR weakness: Reducing entropy by 87.5%

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A vulnerability exists in the Linux kernel's Address Space Layout Randomization (ASLR) implementation affecting AMD Bulldozer (Family 15h) processors. To mitigate cache aliasing penalties, certain memory-mapped objects, including the Virtual Dynamic Shared Object (VDSO) and shared libraries, are assigned memory addresses with bits 12 through 14 set to zero, effectively reducing entropy by 87.5%. This reduction significantly weakens ASLR's effectiveness, making systems more susceptible to exploitation. The issue impacts all Linux processes, including those that are statically compiled without shared libraries.

*Credits: https://hmarco.org
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2024-12-23 CVE Reserved
  • 2025-01-03 CVE Published
  • 2025-01-03 CVE Updated
  • 2025-01-03 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-331: Insufficient Entropy
CAPEC
  • CAPEC-97: Cryptanalysis
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 4.0.0
Search vendor "Linux" for product "Linux Kernel" and version "4.0.0"
-
Affected