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CVE-2023-6931 is a heap out-of-bounds write vulnerability in the Linux kernel Performance Events subsystem. An overflow of a perf_event object's read_size during grouped performance-event reads causes perf_read_group() to increment or write outside the intended heap buffer boundaries.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a proof-of-concept (PoC) exploit for CVE-2023-6931, a heap buffer overflow vulnerability in the Linux kernel's perf_event subsystem. The exploit is implemented in C (PoC.c) and is designed to trigger a kernel panic by exploiting an integer overflow in the calculation of the read_size for a perf event group. The PoC works by creating a group leader perf event with all possible read_format options, then adding a large number of sibling events. This causes the group leader's read_size to overflow, leading to a small buffer allocation and a subsequent heap buffer overflow when reading event data. The README.md provides a detailed explanation of the vulnerability, the requirements for successful exploitation (including kernel configuration and system limits), and the technical details of the attack. The exploit requires local access to the system and appropriate permissions to interact with the perf_event subsystem. The only fingerprintable endpoint is the kernel configuration file /proc/sys/kernel/perf_event_paranoid, which must be set to 1 or lower. The repository is structured simply, with a single C source file for the exploit and a comprehensive markdown README.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel out-of-bounds write in perf_read_group() caused by perf_event read_size overflow.
Linux kernel out-of-bounds write in perf_read_group() caused by overflow of a perf_event read_size.
Linux kernel perf subsystem out-of-bounds write caused by perf_event read_size overflow.
A Linux kernel out-of-bounds write in perf_read_group() caused by overflow of a perf_event read_size.
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