CVE-2026-92509
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.
How to fix
- Linux Linux5eb0c57a8b568eb08f464861d84d518a2af939ac, d5cc211e8c39e46f357d30a092d683e84d560de9, 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b, 8c013e3a8d8273da4d47bf1c27f016a3551996f5, 64c72390d8407ea86de712a477c796b07d37abc4, 235ef2d0e750885c29340b0fc40620a7a4f52e12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 99fa331dc8629be55ac7a0cca0dc56492070ddac ≤ v < 5eb0c57a8b568eb08f464861d84d518a2af939ac, 99fa331dc8629be55ac7a0cca0dc56492070ddac ≤ v < d5cc211e8c39e46f357d30a092d683e84d560de9, 99fa331dc8629be55ac7a0cca0dc56492070ddac ≤ v < 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b, 99fa331dc8629be55ac7a0cca0dc56492070ddac ≤ v < 8c013e3a8d8273da4d47bf1c27f016a3551996f5, 99fa331dc8629be55ac7a0cca0dc56492070ddac ≤ v < 64c72390d8407ea86de712a477c796b07d37abc4, 99fa331dc8629be55ac7a0cca0dc56492070ddac ≤ v < 235ef2d0e750885c29340b0fc40620a7a4f52e12, 5.3 | 5eb0c57a8b568eb08f464861d84d518a2af939ac, d5cc211e8c39e46f357d30a092d683e84d560de9, 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b, 8c013e3a8d8273da4d47bf1c27f016a3551996f5, 64c72390d8407ea86de712a477c796b07d37abc4, 235ef2d0e750885c29340b0fc40620a7a4f52e12 |
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