Linux Kernel CVE-2015-1788 Info Leak: Analysis, Patch, and Mitigation

Vulnerability Summary: CVE-2015-1788 (Linux Kernel Information Disclosure) Overview This vulnerability exists in the file of the Linux kernel, specifically within the function. When reading the file, the kernel outputs the start and end addresses of virtual memory regions in hexadecimal format to user space. Since these addresses correspond to mappings in the kernel's virtual address space, attackers can exploit this information to infer the kernel memory layout. This allows them to bypass security mechanisms such as ASLR (Address Space Layout Randomization), creating conditions for subsequent kernel privilege escalation or code execution attacks. Scope of Impact Affected Systems: All systems running a Linux kernel with and (or similar configurations) enabled. Affected Versions: Linux kernel versions released before 2015 (specific versions should be confirmed based on patch history). Trigger Conditions: The attacker must have access to the target process (e.g., via or shared memory) and the ability to read its file. Remediation The official fix involves modifying the function to replace the directly outputted kernel virtual addresses with a placeholder such as "0x0", thereby preventing the leakage of real addresses. The patch was submitted by Greg Kroah-Hartman and merged into the Linux mainline kernel. Patch Code Snippet > Note: The actual implementation may vary slightly depending on the kernel version, but the core approach is to hide the real addresses. POC / Exploit Code The referenced page does not provide a complete POC or exploit code; it only displays kernel source code snippets related to the vulnerability and the patch content. Below are the key source code snippets for understanding the vulnerability mechanism: Vulnerable Source Code ( ) Fixed Source Code (Patch Version) Recommendations Upgrade the Linux kernel to a version that includes the fix for CVE-2015-1788. If an immediate upgrade is not possible, consider disabling access to (not recommended, as it may impact debugging tools). Monitor the system for any anomalous kernel address leakage behavior. --- > Note: This summary is based on the provided webpage screenshot content and does not include external resources or additional analysis.

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Linux Kernel CVE-2015-1788 Info Leak: Analysis, Patch, and Mitigation