CVE-2026-90219

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: Free debugfs on registration failure c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via setup_debugfs()), but it is removed only in c4iw_remove(), not in c4iw_dealloc(). When RDMA device registration fails, the registration worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing c4iw_remove(), so the debugfs dentries leak and outlive the freed c4iw_dev. Move debugfs_remove_recursive() into c4iw_dealloc() so every path that frees ctx->dev also removes its debugfs tree.

References

• https://git.kernel.org/stable/c/046425412529dbfca1433c8bef5641b271b4ab2a
• https://git.kernel.org/stable/c/459b59f7ed56511d6529311cb4e5e482ebfcfb8e
• https://git.kernel.org/stable/c/479a7f90060e62bdd9bb4036ec0a70bf460f6d23
• https://git.kernel.org/stable/c/c332d9e7dce234d8bef78271d003a68ee943b61b
• https://git.kernel.org/stable/c/cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8