CVE-2026-68146

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ftrace: Add global mutex to serialize trace_parser access

In ftrace, the trace_parser structure is allocated and initialized when

a trace file is opened, and is subsequently used across write and release

handlers to parse user input.

The affected handler paths and their specific functions are:

- Open paths: ftrace_regex_open(), ftrace_graph_open()

- Write paths: ftrace_regex_write(), ftrace_graph_write()

- Release paths: ftrace_regex_release(), ftrace_graph_release()

If userspace opens a trace file descriptor and shares it across multiple

threads, concurrent write calls will race on the parser's internal state,

specifically the 'idx', 'cont', and 'buffer' fields, leading to corrupted

input or undefined behavior.

Fix this by adding a global mutex, parser_lock, to serialize all access

to trace_parser across write and release paths, preventing concurrent

corruption of parser state.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References