CVE-2026-92508

HighCVSS 7.8/10Last modified Oct 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Fix potential use after free in ib_free_cq()

When accessing a CQ via the netlink path the only synchronization mechanism for the said CQ is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_free_cq(), which is too late, since by that point vendor-specific resources associated with the CQ might already be freed. This can leave a short window where the CQ remains accessible through restrack, leading to a potential use-after-free.

Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources ensuring that the CQ is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a CQ that is in the process of destruction.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < a804b162f9bc2b38b2ed1b4752eea9faadb1645b; >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < 91f8a17a22ab615a03743120e19935e731f28fb9; >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < 76f2cb4f721815c3b6262a6dc2151de88646924c; >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < b8dcca427096fc9c50f1b376847fea72bc842d31; >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < 9abea37942534eeb049335476178696b654b000c; >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < 43403fe45379c64fa6276e5a8ede44493e5d2d3d; >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213, < 29dc2f8e1c97372c2871a70088707933515fbd5b; 7ac277a01f9017fcde4f3f81670c995992945433; 093f87dda065e0f618dd577985eccbe85efb9b54; >= 5.8.17, < 5.9; >= 5.9.2, < 5.10
LinuxLinux5.10

References

Timeline

Published
Sep 17, 2026
Last modified
Oct 19, 2026
NVD status
Received

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CVE-2026-92508: High severity, CVSS 7.8 | Vulnix