CVE-2023-52520 platform/x86: think-lmi: Fix reference leak

2024-03-0221:52:28

Linux

github.com

cve-2023-52520

platform/x86

think-lmi

fix reference leak

linux kernel

attribute

kset_find_obj()

kobject_put()

setting name validation

6.9 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.7%

JSON

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

platform/x86: think-lmi: Fix reference leak

If a duplicate attribute is found using kset_find_obj(), a reference
to that attribute is returned which needs to be disposed accordingly
using kobject_put(). Move the setting name validation into a separate
function to allow for this change without having to duplicate the
cleanup code for this setting.
As a side note, a very similar bug was fixed in
commit 7295a996fdab (“platform/x86: dell-sysman: Fix reference leak”),
so it seems that the bug was copied from that driver.

Compile-tested only.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/platform/x86/think-lmi.c"
    ],
    "versions": [
      {
        "version": "1bcad8e510b2",
        "lessThan": "124cf0ea4b82",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1bcad8e510b2",
        "lessThan": "af21c9119a37",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1bcad8e510b2",
        "lessThan": "c6e3023579de",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1bcad8e510b2",
        "lessThan": "528ab3e605ca",
        "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/platform/x86/think-lmi.c"
    ],
    "versions": [
      {
        "version": "5.14",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.14",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.136",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.59",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.5.8",
        "lessThanOrEqual": "6.5.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]