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Vulnerability DatabaseCVE-2025-39683
CVE-2025-39683:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2025-39683 is a vulnerability in the Linux kernel's tracing functionality, discovered and disclosed on September 5, 2025. The vulnerability affects the kernel's handling of the set_ftrace_filter when processing strings that exceed FTRACE_BUFF_MAX length (NVD).
Technical details
The vulnerability occurs when trace_get_user fails to process a string longer than FTRACE_BUFF_MAX but does not properly set the end of parser->buffer to 0. This leads to an out-of-bounds (OOB) access in the call chain ftrace_regex_release-> ftrace_process_regex->strsep->strpbrk. The issue manifests as a KASAN slab-out-of-bounds alarm when reading memory at specific addresses (NVD).
Impact
The vulnerability can trigger a slab-out-of-bounds read in the Linux kernel, potentially leading to memory disclosure or system instability. The issue affects the kernel's tracing subsystem, which is a critical component for system debugging and performance analysis (NVD).
Mitigation and workarounds
The issue has been resolved by implementing proper access limitations to parser->buffer when trace_get_user fails. Multiple kernel patches have been released to address this vulnerability (NVD).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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