Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: gpio: exar: initialize the ID before registering its cleanup devm_add_action_or_reset() invokes the cleanup action immediately when registering the action fails. gpio_exar_probe() currently stores the allocated ID in exar_gpio only after registering the action, so that failure makes exar_devm_ida_free() release ID 0. If the allocated ID is nonzero, this leaks that ID and can free ID 0 belonging to another device. Store the ID before registering the cleanup action so both the immediate failure path and normal device teardown release the correct allocation.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• git.kernel.org/stable/c/01318927a9055136c207399eeb36ce07becac179
• git.kernel.org/stable/c/4d69e74034b208588636ecc177e0dd43a7696af3
• git.kernel.org/stable/c/b78c114600ae3df90c083c72c290437b068577c8
• git.kernel.org/stable/c/bf3d841ef12fcbec4458e2750956b738b043a226
• git.kernel.org/stable/c/f7ec4dbd2a073dd53b6349be1c586fe8580dd6b2