Medium [CVE-2026-89509] Linux kernel RDMA/ionic: NULL pointer dereference leading to Denial of Service
This medium-severity Red Hat Linux advisory covers CVE-2026-89509.
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Summary
A flaw was found in the Linux kernel's RDMA/ionic driver. This vulnerability arises from the driver's incorrect handling of `rdma_counter` allocations, specifically by not embedding counter driver data as required.
This oversight can lead to a NULL pointer dereference when the `alloc_and_bind()` function is called. A local attacker could potentially trigger this flaw, causing the system to crash and resulting in a Denial of Service (DoS).
Red Hat severity: Important — CVSS 4.1 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476.
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 34 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 34 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 34 minutes ago·verify at source
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