{"id":"CVE-2026-92511","title":"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_res…","summary":"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_res…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 08f294a1524bc3211a28091daa6c7513828c7d33 < 42f7a0c7a94003059540cce448acabfa62ad119d","Linux >= 08f294a1524bc3211a28091daa6c7513828c7d33 < 253c2ed71a532c70fa0e64317ceb02bb1a50c84c","Linux >= 08f294a1524bc3211a28091daa6c7513828c7d33 < b85a148731eceffacb6a030950187d785175607f","Linux >= 08f294a1524bc3211a28091daa6c7513828c7d33 < 197c262dbf94c0f7ab7ac54b66f892ce9f343232","Linux >= 08f294a1524bc3211a28091daa6c7513828c7d33 < 8a72a6aad84b3928dbb5e564bff1f56a7ec222ae","Linux >= 08f294a1524bc3211a28091daa6c7513828c7d33 < 3481bec4dfc4aee24ffea5a547ee95b70b67d9d5","Linux 4.16"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:18:13.837","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92511","references":[{"url":"https://git.kernel.org/stable/c/197c262dbf94c0f7ab7ac54b66f892ce9f343232","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/253c2ed71a532c70fa0e64317ceb02bb1a50c84c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3481bec4dfc4aee24ffea5a547ee95b70b67d9d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/42f7a0c7a94003059540cce448acabfa62ad119d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8a72a6aad84b3928dbb5e564bff1f56a7ec222ae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b85a148731eceffacb6a030950187d785175607f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00125,"epssPercentile":0.02574,"ingestedAt":"2026-09-17T16:21:47.779Z","slug":"CVE-2026-92511","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207341,"id":"CVE-2026-92511","ts":1789757341012,"field":"cvss","old":null,"new":"7.8"},{"seq":207340,"id":"CVE-2026-92511","ts":1789757341012,"field":"severity","old":"none","new":"high"}]}