CVE-2026-92508
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.
How to fix
- Linux Linuxa804b162f9bc2b38b2ed1b4752eea9faadb1645b, 91f8a17a22ab615a03743120e19935e731f28fb9, 76f2cb4f721815c3b6262a6dc2151de88646924c, b8dcca427096fc9c50f1b376847fea72bc842d31, 9abea37942534eeb049335476178696b654b000c, 43403fe45379c64fa6276e5a8ede44493e5d2d3d, 29dc2f8e1c97372c2871a70088707933515fbd5b, 5.9, 5.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < a804b162f9bc2b38b2ed1b4752eea9faadb1645b, 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < 91f8a17a22ab615a03743120e19935e731f28fb9, 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < 76f2cb4f721815c3b6262a6dc2151de88646924c, 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < b8dcca427096fc9c50f1b376847fea72bc842d31, 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < 9abea37942534eeb049335476178696b654b000c, 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < 43403fe45379c64fa6276e5a8ede44493e5d2d3d, 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ≤ v < 29dc2f8e1c97372c2871a70088707933515fbd5b, 7ac277a01f9017fcde4f3f81670c995992945433, 093f87dda065e0f618dd577985eccbe85efb9b54, 5.8.17 ≤ v < 5.9, 5.9.2 ≤ v < 5.10, 5.10 | a804b162f9bc2b38b2ed1b4752eea9faadb1645b, 91f8a17a22ab615a03743120e19935e731f28fb9, 76f2cb4f721815c3b6262a6dc2151de88646924c, b8dcca427096fc9c50f1b376847fea72bc842d31, 9abea37942534eeb049335476178696b654b000c, 43403fe45379c64fa6276e5a8ede44493e5d2d3d, 29dc2f8e1c97372c2871a70088707933515fbd5b, 5.9, 5.10 |
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