CVE-2023-54062
ext4: fix invalid free tracking in ext4_xattr_move_to_block()
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.
INFO
Published Date :
Dec. 24, 2025, 1:16 p.m.
Last Modified :
Dec. 24, 2025, 1:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2023-54062
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Store freeing requirement in a separate variable.
- Apply the kernel patch for ext4.
- Update the Linux kernel to the latest version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-54062.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-54062 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-54062
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2023-54062 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-54062 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Dec. 24, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable. Added Reference https://git.kernel.org/stable/c/1a8822343e67432b658145d2760a524c884da9d4 Added Reference https://git.kernel.org/stable/c/76887be2a96193cd11be818551b8934ecdb3123f Added Reference https://git.kernel.org/stable/c/8beaa3cb293a8f7bacf711cf52201d59859dbc40 Added Reference https://git.kernel.org/stable/c/a18670395e5f28acddeca037c5e4bd2ea961b70a Added Reference https://git.kernel.org/stable/c/b2fab1807d26acd1c6115b95b5eddd697d84751b Added Reference https://git.kernel.org/stable/c/b87c7cdf2bed4928b899e1ce91ef0d147017ba45 Added Reference https://git.kernel.org/stable/c/ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a Added Reference https://git.kernel.org/stable/c/c5fa4eedddd1c8342ce533cb401c0e693e55b4e3 Added Reference https://git.kernel.org/stable/c/f30f3391d089dc91aef91d08f4b04a6c0df2b067