CVE-2024-38633

serial: max3100: Update uart_driver_registered on driver removal

MEDIUM

5.5

CVSS Score

Published: June 21, 2024 at 10:18 AM UTC

Updated: June 17, 2026 at 07:40 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.30 ≤ v < 4.19.3162.6.30 ≤ v < 5.10.2192.6.30 ≤ v < 5.15.1612.6.30 ≤ v < 5.4.2782.6.30 ≤ v < 6.1.932.6.30 ≤ v < 6.102.6.30 ≤ v < 6.6.332.6.30 ≤ v < 6.9.44.20 ≤ v < 5.4.2785.11 ≤ v < 5.15.1615.16 ≤ v < 6.1.935.5 ≤ v < 5.10.2196.2 ≤ v < 6.6.336.7 ≤ v < 6.9.42.6.307831d56b0a3544cbb6f82f76c34ca95e24d5b676

Vendor states this is fixed in 21a61a7fbcfdd3493cede43ebc7c4dfae2147a8b (fixed)

Vendor states this is fixed in 361a92c9038e8c8c3996f8eeaa14522a8ad90752 (fixed)

Vendor states this is fixed in 712a1fcb38dc7cac6da63ee79a88708fbf9c45ec (fixed)

Vendor states this is fixed in 9db4222ed8cd3e50b81c8b910ae74c26427a4003 (fixed)

Vendor states this is fixed in b6eb7aff23e05f362e8c9b560f6ac5e727b70e00 (fixed)

Vendor states this is fixed in e8a10089eddba40d4b2080c9d3fc2d2b2488f762 (fixed)

Vendor states this is fixed in e8e2a4339decad7e59425b594a98613402652d72 (fixed)

Vendor states this is fixed in fa84ca78b048dfb00df0ef446f5c35e0a98ca6a0 (fixed)

Vendor states this is fixed in 2.6.30 (unaffected)

Vendor states this is fixed in 4.19.316 (unaffected)

Vendor states this is fixed in 5.10.219 (unaffected)

Vendor states this is fixed in 5.15.161 (unaffected)