CVE-2023-52445 media: pvrusb2: fix use after free on context disconnection

2024-02-2216:21:37

Linux

www.cve.org

linux

kernel

vulnerability

context disconnection

use after free

pvrusb2

7.6 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

media: pvrusb2: fix use after free on context disconnection

Upon module load, a kthread is created targeting the
pvr2_context_thread_func function, which may call pvr2_context_destroy
and thus call kfree() on the context object. However, that might happen
before the usb hub_event handler is able to notify the driver. This
patch adds a sanity check before the invalid read reported by syzbot,
within the context disconnection call stack.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/media/usb/pvrusb2/pvrusb2-context.c"
    ],
    "versions": [
      {
        "version": "e5be15c63804",
        "lessThan": "ec36c134dd02",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "47aa8fcd5e8b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "3233d8bf7893",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "ec3634ebe23f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "30773ea47d41",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "2cf0005d3155",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "437b5f57732b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5be15c63804",
        "lessThan": "ded85b0c0edd",
        "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/media/usb/pvrusb2/pvrusb2-context.c"
    ],
    "versions": [
      {
        "version": "2.6.26",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.26",
        "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": "6.1.75",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.14",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.2",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]