CVE-2026-90077
UnknownSummary
In the Linux kernel, the copy_net_ns() function has a resource leak in its error handling path. When preinit_net() fails, the code jumps to the dec_ucounts label, skipping the release of resources allocated by net_alloc(), such as key_remove_domain() and net_passive_dec().
Risk Assessment
Resource leaks during network namespace creation can lead to gradual kernel memory exhaustion. In multi-tenant environments this may cause system instability.
Recommendation
Update the Linux kernel to a version containing the fix that decouples initialization and properly releases resources on the error path. Monitor kernel memory usage on systems that heavily create network namespaces.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: fix a resource leak in copy_net_ns() error handling path Currently, preinit_net() does two things: (1) call ns_common_init() which might fail (2) initialize resources which does not fail However, preinit_net() is returning early when (1) fails, and copy_net_ns() is jumping to the dec_ucounts: label. As a result, resources allocated by net_alloc() are leaking. We need to call key_remove_domain() and net_passive_dec() in order to release resources allocated by net_alloc(). We cannot simply jump to the put_userns: label when preinit_net() failed, for (2) is not yet done. But we can reorder (1) and (2), for there is no dependency between (1) and (2). Therefore, this patch decouples (1) from preinit_net() and changes preinit_net() back to a void function, and calls ns_common_init() after preinit_net() succeeded. Then, we can jump to immediately after ns_common_free() of the put_userns: label.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS