RDMA/core: Fix potential use after free in uverbs_free_dmah()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93267
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:23 UTC
Updated2026-09-24 16:17:23 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d83edab562a496a42720902a1d2effccd05c37c5 8b22722f45a29a7c0900b1d4d0bc5da5492ece10 git Not specified
CNA Linux Linux affected d83edab562a496a42720902a1d2effccd05c37c5 bfc119a40c04bbe3daad826f2160ccbfae6c64ce git Not specified
CNA Linux Linux affected d83edab562a496a42720902a1d2effccd05c37c5 2696626a0be5877f445fb647c25ef43930c777e6 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bfc119a40c04bbe3daad826f2160ccbfae6c64ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2696626a0be5877f445fb647c25ef43930c777e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8b22722f45a29a7c0900b1d4d0bc5da5492ece10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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