CVE-2026-92509

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux99fa331dc8629be55ac7a0cca0dc56492070ddac < 5eb0c57a8b568eb08f464861d84d518a2af939acaffected
LinuxLinux99fa331dc8629be55ac7a0cca0dc56492070ddac < d5cc211e8c39e46f357d30a092d683e84d560de9affected
LinuxLinux99fa331dc8629be55ac7a0cca0dc56492070ddac < 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5baffected
LinuxLinux99fa331dc8629be55ac7a0cca0dc56492070ddac < 8c013e3a8d8273da4d47bf1c27f016a3551996f5affected
LinuxLinux99fa331dc8629be55ac7a0cca0dc56492070ddac < 64c72390d8407ea86de712a477c796b07d37abc4affected
LinuxLinux99fa331dc8629be55ac7a0cca0dc56492070ddac < 235ef2d0e750885c29340b0fc40620a7a4f52e12affected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References