{"id":"CVE-2026-92508","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-92508","summary":"RDMA/core: Fix potential use after free in ib_free_cq()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in ib_free_cq()\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_free_cq(), 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_del() call to be before the freeing\nof the vendor-specific resources ensuring that the CQ is removed from\nrestrack before its internal resources are released.\nThis guarantees that no new users hold references to a CQ that is in\nthe process of destruction.","published":"2026-09-17T16:10:19.443Z","modified":"2026-09-19T03:47:31.094847260Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.15.221"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/29dc2f8e1c97372c2871a70088707933515fbd5b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43403fe45379c64fa6276e5a8ede44493e5d2d3d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/76f2cb4f721815c3b6262a6dc2151de88646924c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91f8a17a22ab615a03743120e19935e731f28fb9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9abea37942534eeb049335476178696b654b000c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a804b162f9bc2b38b2ed1b4752eea9faadb1645b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8dcca427096fc9c50f1b376847fea72bc842d31"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92508.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92508"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-19T03:47:31.094847260Z"}}