CVE-2021-47467: kunit: fix reference count leak in kfree_at_end
First published: Wed May 22 2024(Updated: )
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 <skhan@linuxfoundation.org> CHECK: Alignment should match open parenthesis + kunit_alloc_resource(test, NULL, kfree_res_free, GFP_KERNEL, (void *)to_free);
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.14<5.14.15 | |
| Linux Kernel | =5.15-rc1 | |
| Linux Kernel | =5.15-rc2 | |
| Linux Kernel | =5.15-rc3 | |
| Linux Kernel | =5.15-rc4 | |
| Linux Kernel | =5.15-rc5 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47467?
CVE-2021-47467 has been classified as a medium severity vulnerability.
How do I fix CVE-2021-47467?
To fix CVE-2021-47467, update to a patched version of the Linux kernel that addresses this vulnerability.
What software is affected by CVE-2021-47467?
CVE-2021-47467 affects specific versions of the Linux kernel.
What is the nature of the vulnerability in CVE-2021-47467?
CVE-2021-47467 is a reference counting issue that can lead to memory management problems.
Is there a workaround for CVE-2021-47467?
There is no specific workaround for CVE-2021-47467; upgrading the kernel is recommended.
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