CVE-2023-52439 uio: Fix use-after-free in uio_open

2024-02-2018:34:49

Linux

www.cve.org

linux kernel

use-after-free

uio_open

uio_unregister_device

device_unregister

kfree

idev

uio_release

7.8 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

5.1%

JSON

In the Linux kernel, the following vulnerability has been resolved:

uio: Fix use-after-free in uio_open

core-1 core-2

uio_unregister_device uio_open
idev = idr_find()
device_unregister(&idev->dev)
put_device(&idev->dev)
uio_device_release
get_device(&idev->dev)
kfree(idev)
uio_free_minor(minor)
uio_release
put_device(&idev->dev)
kfree(idev)

In the core-1 uio_unregister_device(), the device_unregister will kfree
idev when the idev->dev kobject ref is 1. But after core-1
device_unregister, put_device and before doing kfree, the core-2 may
get_device. Then:

After core-1 kfree idev, the core-2 will do use-after-free for idev.
When core-2 do uio_release and put_device, the idev will be double
freed.

To address this issue, we can get idev atomic & inc idev reference with
minor_lock.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/uio/uio.c"
    ],
    "versions": [
      {
        "version": "57c5f4df0a5a",
        "lessThan": "3174e0f7de1b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "e93da893d52d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "5e0be1229ae1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "5cf604ee538e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "17a8519cb359",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "35f102607054",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "913205930da6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "57c5f4df0a5a",
        "lessThan": "0c9ae0b86050",
        "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/uio/uio.c"
    ],
    "versions": [
      {
        "version": "4.18",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.18",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.306",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.268",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.209",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.148",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.74",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.13",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.1",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]