Oracle Linux: CVE-2024-38633: ELSA-2024-12581: Unbreakable Enterprise kernel security update (IMPORTANT) (Multiple Advisories)

Oracle Linux: CVE-2024-38633: ELSA-2024-12581: Unbreakable Enterprise kernel security update (IMPORTANT) (Multiple Advisories)

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

06/21/2024

Created

08/20/2024

Added

08/16/2024

Modified

01/23/2025

Description

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. A vulnerability was found in the Linux kernel, affecting the `max3100` serial driver. This issue involves improper handling of the `uart_driver_registered` state upon driver removal, which could lead to use-after-free conditions or undefined behavior. This flaw might allow attackers to exploit the driver to gain unauthorized access or cause system instability.

Solution(s)

• oracle-linux-upgrade-kernel-uek

References

• https://attackerkb.com/topics/cve-2024-38633
• CVE - 2024-38633
• ELSA-2024-12581
• ELSA-2024-12584
• ELSA-2024-12585
• ELSA-2024-12611