Medium [CVE-2026-89510] Linux kernel: RDMA/cxgb4 use-after-free vulnerability
This medium-severity Red Hat Linux advisory covers CVE-2026-89510 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the Linux kernel's RDMA/cxgb4 component. This vulnerability occurs when the `c4iw_remove()` function frees a device while its registration work (`reg_work`) is still pending or actively running.
This timing issue can lead to the `c4iw_register_device()` function attempting to access memory that has already been deallocated. The primary consequence of this use-after-free vulnerability is system instability, which could potentially lead to a denial of service.
Red Hat severity: Important — CVSS 5.2 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H). Weakness: CWE-825.
Affected Red Hat products: Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
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