CVE-2026-90219
Published Sep 17, 2026
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.
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References
Other 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
https://git.kernel.org/stable/c/ea41b5630fa3d9877ce9ed8832cf5575f742bfbb
https://git.kernel.org/stable/c/f98e894ec029a752cf9c7f7834741bead0fb463d
https://git.kernel.org/stable/c/fe5c16bb6252dea6025b748257ddc3b2665495b0
Frequently Asked Questions
What is CVE-2026-90219? +
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.
How do I check if I'm vulnerable to CVE-2026-90219? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.