CVE-2026-93267
UnknownSummary
In the Linux kernel, the RDMA/core uverbs_free_dmah() function called rdma_restrack_del() too late, after vendor-specific resources associated with the dmah had already been freed. This left a short window where the dmah remained accessible through restrack, potentially leading to a use-after-free.
Risk Assessment
A use-after-free in the RDMA subsystem can cause kernel crashes, memory corruption, or potential privilege escalation by a local attacker.
Recommendation
Update the Linux kernel to a version with the fix that moves the rdma_restrack_begin_del() call to the start of uverbs_free_dmah(), removing the dmah from restrack before its resources are released.
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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 uverbs_free_dmah() When accessing a dmah via the netlink path the only synchronization mechanism for the said dmah is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of uverbs_free_dmah(), which is too late, since by that point vendor-specific resources associated with the dmah might already be freed. This can leave a short window where the dmah 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 uverbs_free_dmah(), ensuring that the dmah is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a dmah 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