{"id":"CVE-2026-92508","title":"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_ge…","summary":"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_ge…","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 >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < a804b162f9bc2b38b2ed1b4752eea9faadb1645b","Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < 91f8a17a22ab615a03743120e19935e731f28fb9","Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < 76f2cb4f721815c3b6262a6dc2151de88646924c","Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < b8dcca427096fc9c50f1b376847fea72bc842d31","Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < 9abea37942534eeb049335476178696b654b000c","Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < 43403fe45379c64fa6276e5a8ede44493e5d2d3d","Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 < 29dc2f8e1c97372c2871a70088707933515fbd5b","Linux 7ac277a01f9017fcde4f3f81670c995992945433","Linux 093f87dda065e0f618dd577985eccbe85efb9b54","Linux >= 5.8.17 < 5.9","Linux >= 5.9.2 < 5.10","Linux 5.10"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:18:13.500","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92508","references":[{"url":"https://git.kernel.org/stable/c/29dc2f8e1c97372c2871a70088707933515fbd5b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/43403fe45379c64fa6276e5a8ede44493e5d2d3d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/76f2cb4f721815c3b6262a6dc2151de88646924c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/91f8a17a22ab615a03743120e19935e731f28fb9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9abea37942534eeb049335476178696b654b000c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a804b162f9bc2b38b2ed1b4752eea9faadb1645b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b8dcca427096fc9c50f1b376847fea72bc842d31","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.0016,"epssPercentile":0.05536,"ingestedAt":"2026-09-17T16:21:47.780Z","slug":"CVE-2026-92508","body":"## Overview\n\nIn 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.\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":207337,"id":"CVE-2026-92508","ts":1789757340970,"field":"cvss","old":null,"new":"7.8"},{"seq":207336,"id":"CVE-2026-92508","ts":1789757340970,"field":"severity","old":"none","new":"high"}]}