CVE-2025-40055: ocfs2: fix double free in user_cluster_connect()

Severity: unknown
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: 2025-10-28 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix double free in user_cluster_connect() user_cluster_disconnect() frees "conn->cc_private" which is "lc" but then the error handling frees "lc" a second time. Set "lc" to NULL on this path to avoid a double free.

Affected products

Linux kernel: 3.14 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/283333079d96c84baa91f0c62b5e0cbec246b7a2
https://git.kernel.org/stable/c/694d5b401036a614f8080085a9de6f86ff0742dc
https://git.kernel.org/stable/c/7e76fe9dfadbc00364d7523d5a109e9d3e4a7db2
https://git.kernel.org/stable/c/827c8efa0d1afe817b90f3618afff552e88348d2
https://git.kernel.org/stable/c/892f41e12c8689130d552a9eb2b77bafd26484ab
https://git.kernel.org/stable/c/8f45f089337d924db24397f55697cda0e6960516
https://git.kernel.org/stable/c/bfe011297ddd2d0cd64752978baaa0c04cd20573
https://git.kernel.org/stable/c/f992bc72f681c32a682d474a29c2135a64d4f4e5

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