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cve416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2021-47467
HistoryMay 22, 2024 - 7:15 a.m.

CVE-2021-47467

2024-05-2207:15:11
416baaa9-dc9f-4396-8d5f-8c081fb06d67
web.nvd.nist.gov
27
kunit resource leak
linux kernel
reference count
vulnerability
fix

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.0%

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

kunit: fix reference count leak in kfree_at_end

The reference counting issue happens in the normal path of
kfree_at_end(). When kunit_alloc_and_get_resource() is invoked, the
function forgets to handle the returned resource object, whose refcount
increased inside, causing a refcount leak.

Fix this issue by calling kunit_alloc_resource() instead of
kunit_alloc_and_get_resource().

Fixed the following when applying:
Shuah Khan <[email protected]>

CHECK: Alignment should match open parenthesis

  • kunit_alloc_resource(test, NULL, kfree_res_free, GFP_KERNEL,
    (void *)to_free);

Affected configurations

Vulners
Node
linuxlinux_kernelRange5.14.05.14.15
OR
linuxlinux_kernelRange5.15.0

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "lib/kunit/executor_test.c"
    ],
    "versions": [
      {
        "version": "1da177e4c3f4",
        "lessThan": "bbdd158b40b6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "f62314b1ced2",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "lib/kunit/executor_test.c"
    ],
    "versions": [
      {
        "version": "5.14.15",
        "lessThanOrEqual": "5.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.0%