CVE-2026-92508RDMA/core: Fix potential use after free in ib_free_cq()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 before a804b162f9bc2b38b2ed1b4752eea9faadb1645b; from 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 before 91f8a17a22ab615a03743120e19935e731f28fb9; from 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 before 76f2cb4f721815c3b6262a6dc2151de88646924c; from 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 before b8dcca427096fc9c50f1b376847fea72bc842d31; 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 builds before 9abea37942534eeb049335476178696b654b000c; from 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 before 43403fe45379c64fa6276e5a8ede44493e5d2d3d; 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 builds before 29dc2f8e1c97372c2871a70088707933515fbd5b; 7ac277a01f9017fcde4f3f81670c995992945433; and 3 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/a804b162f9bc2b38b2ed1b4752eea9faadb1645b
- https://git.kernel.org/stable/c/91f8a17a22ab615a03743120e19935e731f28fb9
- https://git.kernel.org/stable/c/76f2cb4f721815c3b6262a6dc2151de88646924c
- https://git.kernel.org/stable/c/b8dcca427096fc9c50f1b376847fea72bc842d31
- https://git.kernel.org/stable/c/9abea37942534eeb049335476178696b654b000c
- https://git.kernel.org/stable/c/43403fe45379c64fa6276e5a8ede44493e5d2d3d
- https://git.kernel.org/stable/c/29dc2f8e1c97372c2871a70088707933515fbd5b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.