CVE-2026-92508

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

State: Published
Severity: 7.8 High
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 16, 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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before a804b162f9bc2b38b2ed1b4752eea9faadb1645bAffected 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 91f8a17a22ab615a03743120e19935e731f28fb9Affected 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 76f2cb4f721815c3b6262a6dc2151de88646924cAffected 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before b8dcca427096fc9c50f1b376847fea72bc842d31Affected 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 9abea37942534eeb049335476178696b654b000cAffected 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 43403fe45379c64fa6276e5a8ede44493e5d2d3dAffected 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 29dc2f8e1c97372c2871a70088707933515fbd5bAffected 7ac277a01f9017fcde4f3f81670c995992945433Affected 093f87dda065e0f618dd577985eccbe85efb9b54Affected 5.8.17 to before 5.9Affected 5.9.2 to before 5.10Affected
LinuxLinux	5.10Affected before 5.10Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before a804b162f9bc2b38b2ed1b4752eea9faadb1645bAffected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 91f8a17a22ab615a03743120e19935e731f28fb9Affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 76f2cb4f721815c3b6262a6dc2151de88646924cAffected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before b8dcca427096fc9c50f1b376847fea72bc842d31Affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 9abea37942534eeb049335476178696b654b000cAffected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 43403fe45379c64fa6276e5a8ede44493e5d2d3dAffected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213 to before 29dc2f8e1c97372c2871a70088707933515fbd5bAffected
7ac277a01f9017fcde4f3f81670c995992945433Affected
093f87dda065e0f618dd577985eccbe85efb9b54Affected
5.8.17 to before 5.9Affected
5.9.2 to before 5.10Affected

LinuxLinux

5.10Affected
before 5.10Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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