CVE-2026-68146

About vulnerability

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.

Affected product:

AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 ELS , Debian 11 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS

Affected packages:

linux @ 4.19.0 (+19 more)

Live-patch status from KernelCare for each operating system.