CVE-2025-68816

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: fw_tracer, Validate format string parameters Add validation for format string parameters in the firmware tracer to prevent potential security vulnerabilities and crashes from malformed format strings received from firmware. The firmware tracer receives format strings from the device firmware and uses them to format trace messages. Without proper validation, bad firmware could provide format strings with invalid format specifiers (e.g., %s, %p, %n) that could lead to crashes, or other undefined behavior. Add mlx5_tracer_validate_params() to validate that all format specifiers in trace strings are limited to safe integer/hex formats (%x, %d, %i, %u, %llx, %lx, etc.). Reject strings containing other format types that could be used to access arbitrary memory or cause crashes. Invalid format strings are added to the trace output for visibility with "BAD_FORMAT: " prefix.

• https://git.kernel.org/stable/c/38ac688b52ef26a88f8bc4fe26d24fdd0ff91e5d
• https://git.kernel.org/stable/c/45bd283b1d69e2c97cddcb9956f0e0261fc4efd7
• https://git.kernel.org/stable/c/768d559f466cdd72849110a7ecd76a21d52dcfe3
• https://git.kernel.org/stable/c/8ac688c0e430dab19f6a9b70df94b1f635612c1a
• https://git.kernel.org/stable/c/8c35c2448086870509ede43947845be0833251f0
• https://git.kernel.org/stable/c/95624b731c490a4b849844269193a233d6d556a0
• https://git.kernel.org/stable/c/b35966042d20b14e2d83330049f77deec5229749

Published

Jan 13, 2026

Last Modified

Jun 17, 2026

Status

Deferred