CVE-2026-92507
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the RDMA/core subsystem has a potential use-after-free in ib_dealloc_pd_user(). rdma_restrack_del() is invoked too late, leaving the PD accessible through restrack while vendor-specific resources are already being freed.
Risk Assessment
Can lead to kernel memory corruption, system crash, or potential privilege escalation on systems using RDMA.
Recommendation
Update the Linux kernel to a version with the fix moving rdma_restrack_begin_del() to the start of ib_dealloc_pd_user(). Until patched, restrict netlink-based PD deallocation operations.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in ib_dealloc_pd_user() When accessing a PD via the netlink path the only synchronization mechanism for the said PD is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_dealloc_pd_user(), which is too late, since by that point vendor-specific resources associated with the PD might already be freed. This can leave a short window where the PD remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_begin_del() call to the start of ib_dealloc_pd_user(), ensuring that the PD is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a PD that is in the process of destruction. In addition, this change preserves the intended inverted order between create and destroy routines: resources are added to restrack at the end of successful creation, and hence shall be removed from the restrack first thing during the destruction flow, which keeps the lifecycle management consistent and predictable.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS