IT

Tracker / CVE-2024-38633

CVE-2024-38633

Medium 5.5

In the Linux kernel, the following vulnerability has been resolved: serial: max3100: Update uart_driver_registered on driver removal The removal of the last MAX3100 device triggers the removal of the driver. However, code doesn't update the respective global variable and after insmod — rmmod — insmod cycle the kernel oopses: max3100 spi-PRP0001:01: max3100_probe: adding port 0 BUG: kernel NULL pointer dereference, address: 0000000000000408 ... RIP: 0010:serial_core_register_port+0xa0/0x840 ... max3100_probe+0x1b6/0x280 [max3100] spi_probe+0x8d/0xb0 Update the actual state so next time UART driver will be registered again. Hugo also noticed, that the error path in the probe also affected by having the variable set, and not cleared. Instead of clearing it move the assignment after the successfull uart_register_driver() call.

Affected products and versions

linux linux_kernel · 2.6.30 → 4.19.316
linux linux_kernel · 4.20 → 5.4.278
linux linux_kernel · 5.11 → 5.15.161
linux linux_kernel · 5.16 → 6.1.93
linux linux_kernel · 5.5 → 5.10.219
linux linux_kernel · 6.2 → 6.6.33
linux linux_kernel · 6.7 → 6.9.4

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References