{"id":"CVE-2026-93267","published":"2026-09-24T16:17:23.570","lastModified":"2026-09-24T16:17:23.570","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in uverbs_free_dmah()\n\nWhen accessing a dmah via the netlink path the only synchronization\nmechanism for the said dmah is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\nuverbs_free_dmah(), which is too late, since by that point\nvendor-specific resources associated with the dmah might already be\nfreed. This can leave a short window where the dmah remains accessible\nthrough restrack, leading to a potential use-after-free.\n\nFix this by moving the rdma_restrack_begin_del() call to the start of\nuverbs_free_dmah(), ensuring that the dmah is removed from restrack\nbefore its internal resources are released. This guarantees that no new\nusers hold references to a dmah that is in the process of destruction.\n\nIn addition, this change preserves the intended inverted order\nbetween create and destroy routines: resources are added to\nrestrack at the end of successful creation, and hence shall be removed\nfrom the restrack first thing during the destruction flow, which keeps\nthe lifecycle management consistent and predictable.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2696626a0be5877f445fb647c25ef43930c777e6","tags":[]},{"url":"https://git.kernel.org/stable/c/8b22722f45a29a7c0900b1d4d0bc5da5492ece10","tags":[]},{"url":"https://git.kernel.org/stable/c/bfc119a40c04bbe3daad826f2160ccbfae6c64ce","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}