Vulnerability 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 However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored.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.
References
- https://git.kernel.org/stable/c/1a8822343e67432b658145d2760a524c884da9d4
- https://git.kernel.org/stable/c/76887be2a96193cd11be818551b8934ecdb3123f
- https://git.kernel.org/stable/c/8beaa3cb293a8f7bacf711cf52201d59859dbc40
- https://git.kernel.org/stable/c/a18670395e5f28acddeca037c5e4bd2ea961b70a
- https://git.kernel.org/stable/c/b2fab1807d26acd1c6115b95b5eddd697d84751b
- https://git.kernel.org/stable/c/b87c7cdf2bed4928b899e1ce91ef0d147017ba45
- https://git.kernel.org/stable/c/ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a
- https://git.kernel.org/stable/c/c5fa4eedddd1c8342ce533cb401c0e693e55b4e3
- https://git.kernel.org/stable/c/f30f3391d089dc91aef91d08f4b04a6c0df2b067
FAQ
What is CVE-2023-54062?
CVE-2023-54062 is a documented vulnerability. 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 w...
How severe is CVE-2023-54062?
CVSS scoring is not yet available for CVE-2023-54062. Check NVD for updates.
Is there a patch for CVE-2023-54062?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.