CVE-2024-36895 usb: gadget: uvc: use correct buffer size when parsing configfs lists

2024-05-3015:29:00

Linux

www.cve.org

linux kernel

usb

gadget

uvc

configfs

buffer size

32-bit platform

heap allocation

buffer overrun

64-bit platform

dwframeinteval

6.6 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.6%

JSON

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

usb: gadget: uvc: use correct buffer size when parsing configfs lists

This commit fixes uvc gadget support on 32-bit platforms.

Commit 0df28607c5cb (“usb: gadget: uvc: Generalise helper functions for
reuse”) introduced a helper function __uvcg_iter_item_entries() to aid
with parsing lists of items on configfs attributes stores. This function
is a generalization of another very similar function, which used a
stack-allocated temporary buffer of fixed size for each item in the list
and used the sizeof() operator to check for potential buffer overruns.
The new function was changed to allocate the now variably sized temp
buffer on heap, but wasn’t properly updated to also check for max buffer
size using the computed size instead of sizeof() operator.

As a result, the maximum item size was 7 (plus null terminator) on
64-bit platforms, and 3 on 32-bit ones. While 7 is accidentally just
barely enough, 3 is definitely too small for some of UVC configfs
attributes. For example, dwFrameInteval, specified in 100ns units,
usually has 6-digit item values, e.g. 166666 for 60fps.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/usb/gadget/function/uvc_configfs.c"
    ],
    "versions": [
      {
        "version": "0df28607c5cb",
        "lessThan": "7a54e5052bde",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0df28607c5cb",
        "lessThan": "a422089ce42c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0df28607c5cb",
        "lessThan": "650ae71c8074",
        "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/usb/gadget/function/uvc_configfs.c"
    ],
    "versions": [
      {
        "version": "6.3",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.3",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.31",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.10",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]