fs: fix UAF/GPF bug in nilfs_mdt_destroy
In the Linux kernel, the following vulnerability has been resolved: fs: fix UAF/GPF bug in nilfs_mdt_destroy In alloc_inode, inode_init_always() could return -ENOMEM if security_inode_alloc() fails, which causes inode->i_private uninitialized. Then nilfs_is_metadata_file_inode() returns true and nilfs_free_inode() wrongly calls nilfs_mdt_destroy(), which frees the uninitialized inode->i_private and leads to crashes(e.g., UAF/GPF). Fix this by moving security_inode_alloc just prior to this_cpu_inc(nr_inodes)
02 / AFFECTED SOFTWARE
Affected packages
2080 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: fs: fix UAF/GPF bug in nilfs_mdt_destroy In alloc_inode, inode_init_always() could return -ENOMEM if security_inode_alloc() fails, which causes inode->i_private uninitialized. Then nilfs_is_metadata_file_inode() returns true and nilfs_free_inode() wrongly calls nilfs_mdt_destroy(), which frees the uninitialized inode->i_private and leads to crashes(e.g., UAF/GPF). Fix this by moving security_inode_alloc just prior to this_cpu_inc(nr_inodes)
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/1e555c3ed1fce4b278aaebe18a64a934cece57d8
- https://git.kernel.org/stable/c/2a96b532098284ecf8e4849b8b9e5fc7a28bdee9
- https://git.kernel.org/stable/c/2e488f13755ffbb60f307e991b27024716a33b29
- https://git.kernel.org/stable/c/64b79e632869ad3ef6c098a4731d559381da1115
- https://git.kernel.org/stable/c/70e4f70d54e0225f91814e8610477d65f33cefe4
- https://git.kernel.org/stable/c/81de80330fa6907aec32eb54c5619059e6e36452
- https://git.kernel.org/stable/c/c0aa76b0f17f59dd9c9d3463550a2986a1d592e4
- https://git.kernel.org/stable/c/d1ff475d7c83289d0a7faef346ea3bbf90818bad
- https://git.kernel.org/stable/c/ec2aab115eb38ac4992ea2fcc2a02fbe7af5cf48
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50367.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-50367