CVE-2024-38633

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < 21a61a7fbcfdd3493cede43ebc7c4dfae2147a8baffected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < 9db4222ed8cd3e50b81c8b910ae74c26427a4003affected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < e8e2a4339decad7e59425b594a98613402652d72affected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < 361a92c9038e8c8c3996f8eeaa14522a8ad90752affected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < b6eb7aff23e05f362e8c9b560f6ac5e727b70e00affected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < e8a10089eddba40d4b2080c9d3fc2d2b2488f762affected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < fa84ca78b048dfb00df0ef446f5c35e0a98ca6a0affected
LinuxLinux7831d56b0a3544cbb6f82f76c34ca95e24d5b676 < 712a1fcb38dc7cac6da63ee79a88708fbf9c45ecaffected
LinuxLinux2.6.30affected
LinuxLinux0 < 2.6.30unaffected
LinuxLinux4.19.316 <= 4.19.*unaffected
LinuxLinux5.4.278 <= 5.4.*unaffected
LinuxLinux5.10.219 <= 5.10.*unaffected
LinuxLinux5.15.161 <= 5.15.*unaffected
LinuxLinux6.1.93 <= 6.1.*unaffected
LinuxLinux6.6.33 <= 6.6.*unaffected
LinuxLinux6.9.4 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References