{"id":"CVE-2026-92511","summary":"RDMA/core: Fix potential use after free in ib_destroy_cq_user()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in ib_destroy_cq_user()\n\nWhen accessing a CQ via the netlink path the only synchronization\nmechanism for the said CQ is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\nib_destroy_cq_user(), which is too late, since by that point\nvendor-specific resources associated with the CQ might already be\nfreed. This can leave a short window where the CQ 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\nib_destroy_cq_user(), ensuring that the CQ is removed from restrack\nbefore its internal resources are released. This guarantees that no new\nusers hold references to a CQ 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.","modified":"2026-09-20T11:30:20.951124467Z","published":"2026-09-17T16:10:21.449Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92511.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/197c262dbf94c0f7ab7ac54b66f892ce9f343232"},{"type":"WEB","url":"https://git.kernel.org/stable/c/253c2ed71a532c70fa0e64317ceb02bb1a50c84c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3481bec4dfc4aee24ffea5a547ee95b70b67d9d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/42f7a0c7a94003059540cce448acabfa62ad119d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a72a6aad84b3928dbb5e564bff1f56a7ec222ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b85a148731eceffacb6a030950187d785175607f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92511.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92511"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"08f294a1524bc3211a28091daa6c7513828c7d33"},{"fixed":"42f7a0c7a94003059540cce448acabfa62ad119d"},{"fixed":"253c2ed71a532c70fa0e64317ceb02bb1a50c84c"},{"fixed":"b85a148731eceffacb6a030950187d785175607f"},{"fixed":"197c262dbf94c0f7ab7ac54b66f892ce9f343232"},{"fixed":"8a72a6aad84b3928dbb5e564bff1f56a7ec222ae"},{"fixed":"3481bec4dfc4aee24ffea5a547ee95b70b67d9d5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92511.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92511.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}