CVE-2026-93267RDMA/core: Fix potential use after free in uverbs_free_dmah()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d83edab562a496a42720902a1d2effccd05c37c5 before 8b22722f45a29a7c0900b1d4d0bc5da5492ece10; from d83edab562a496a42720902a1d2effccd05c37c5 before bfc119a40c04bbe3daad826f2160ccbfae6c64ce; from d83edab562a496a42720902a1d2effccd05c37c5 before 2696626a0be5877f445fb647c25ef43930c777e6 | CNA record |
References
- https://git.kernel.org/stable/c/8b22722f45a29a7c0900b1d4d0bc5da5492ece10
- https://git.kernel.org/stable/c/bfc119a40c04bbe3daad826f2160ccbfae6c64ce
- https://git.kernel.org/stable/c/2696626a0be5877f445fb647c25ef43930c777e6
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.