CVE-2025-71274
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
A race condition in the Linux kernel's rpmsg subsystem in driver_override_show() was found. It reads the driver_override string without holding the device_lock, while the store function frees it under that lock, leading to a use-after-free.
Risk Assessment
An attacker could exploit this to access freed memory, potentially causing system crashes or privilege escalation.
Recommendation
Apply the Linux kernel patch that replaces the rpmsg_string_attr macro with proper show/store functions using device_lock.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rpmsg: core: fix race in driver_override_show() and use core helper The driver_override_show function reads the driver_override string without holding the device_lock. However, the store function modifies and frees the string while holding the device_lock. This creates a race condition where the string can be freed by the store function while being read by the show function, leading to a use-after-free. To fix this, replace the rpmsg_string_attr macro with explicit show and store functions. The new driver_override_store uses the standard driver_set_override helper. Since the introduction of driver_set_override, the comments in include/linux/rpmsg.h have stated that this helper must be used to set or clear driver_override, but the implementation was not updated until now. Because driver_set_override modifies and frees the string while holding the device_lock, the new driver_override_show now correctly holds the device_lock during the read operation to prevent the race. Additionally, since rpmsg_string_attr has only ever been used for driver_override, removing the macro simplifies the code.