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CVE-2023-53408: trace/blktrace: fix memory leak with using debugfs_lookup()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-18 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: trace/blktrace: 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 5.15.99; from 5.16 before 6.1.16; from 6.2 before 6.2.3 — fixed in 5.15.99, 6.1.16, 6.2.3

How to fix

Upgrade to a fixed version: Linux kernel 5.15.99, 6.1.16, 6.2.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3036f5f5ae5210797d95446795df01c1249af9ad
• https://git.kernel.org/stable/c/5286b72fb425291af5f4ca7285d73c16a08d8691
• https://git.kernel.org/stable/c/83e8864fee26f63a7435e941b7c36a20fd6fe93e
• https://git.kernel.org/stable/c/a2e4b48d6f9b39aa19bafe223f9dd436a692fc80

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