CVE-2026-92509

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Fix potential use after free in counter_release()

When accessing a counter via the netlink path the only synchronization

mechanism for the said counter is rdma_restrack_get().

Currently, rdma_restrack_del() is invoked at the end of

counter_release(), which is too late, since by that point

vendor-specific resources associated with the counter might already be

freed. This can leave a short window where the counter remains

accessible through restrack, leading to a potential use-after-free.

Fix this by moving the rdma_restrack_del() call to be before the

freeing of the vendor-specific resources, ensuring that the counter is

removed from restrack before its internal resources are released.

This guarantees that no new users hold references to a counter that is

in the process of destruction.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References