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CVE-2023-53097: powerpc/iommu: fix memory leak with using debugfs_lookup()

• Severity: medium (CVSS 5.5 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: 2025-05-02 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/iommu: fix memory leak with using debugfs_lookup() When calling debugfs_lookup() the result must have dput() called on it, otherwise the memory will leak over time. To make things simpler, just call debugfs_lookup_and_remove() instead which handles all of the logic at once.

Affected products

• Linux kernel: before 5.15.103; from 5.16 before 6.1.20; from 6.2 before 6.2.7 — fixed in 5.15.103, 6.1.20, 6.2.7

How to fix

Upgrade to a fixed version: Linux kernel 5.15.103, 6.1.20, 6.2.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24c1bd1cd0d1ff821fd7d2f01a1e648c7882dfc2
• https://git.kernel.org/stable/c/4050498c0ae3946c223fc63e9dd7b878b76611e0
• https://git.kernel.org/stable/c/b505063910c134778202dfad9332dfcecb76bab3
• https://git.kernel.org/stable/c/e3a62a35f903fd8be5b44542fe3901ec45f16757

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