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CVE-2022-50367: fs: fix UAF/GPF bug in nilfs_mdt_destroy

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-17 · updated 2026-06-17
• Weakness: CWE-416

Description

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)

Affected products

• Linux kernel: before 4.9.331; from 4.10 before 4.14.296; from 4.15 before 4.19.262; from 4.20 before 5.4.218; from 5.5 before 5.10.148; from 5.11 before 5.15.73 — fixed in 4.14.296, 4.19.262, 4.9.331, 5.10.148, 5.15.73, 5.19.15

How to fix

Upgrade to a fixed version: Linux kernel 4.14.296, 4.19.262, 4.9.331, 5.10.148. Check the vendor advisory for mitigations.

References

• 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

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