CVE-2024-38633

2024-06-2111:15:12

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

max3100

vulnerability

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.1%

JSON

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 configurations

Vulners

Node

linuxlinux_kernelRange2.6.30–4.19.316

linuxlinux_kernelRange4.20.0–5.4.278

linuxlinux_kernelRange5.5.0–5.10.219

linuxlinux_kernelRange5.11.0–5.15.161

linuxlinux_kernelRange5.16.0–6.1.93

linuxlinux_kernelRange6.2.0–6.6.33

linuxlinux_kernelRange6.7.0–6.9.4

linuxlinux_kernelRange6.10.0–6.10-rc1

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/tty/serial/max3100.c"
    ],
    "versions": [
      {
        "version": "7831d56b0a35",
        "lessThan": "21a61a7fbcfd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "9db4222ed8cd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "e8e2a4339dec",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "361a92c9038e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "b6eb7aff23e0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "e8a10089eddb",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "fa84ca78b048",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7831d56b0a35",
        "lessThan": "712a1fcb38dc",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/tty/serial/max3100.c"
    ],
    "versions": [
      {
        "version": "2.6.30",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.30",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.316",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.278",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.219",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.161",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.93",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.33",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.4",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]