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CVE-2026-43120

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix double free related to rereg_user_mr If IB_MR_REREG_TRANS is set during rereg_user_mr, the umem will be release…

Published May 6, 2026CWE-415EPSS 0.18%

Overview

CVE-2026-43120 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/irdma: Fix double free related to rereg_user_mr

If IB_MR_REREG_TRANS is set during rereg_user_mr, the

umem will be released and a new one will be allocated

in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans

fails after the new umem is allocated, it releases the umem,

but does not set iwmr->region to NULL. The problem is that

this failure is propagated to the user, who will then call

ibv_dereg_mr (as they should). Then, the dereg_mr path will

see a non-NULL umem and attempt to call ib_umem_release again.

Fix this by setting iwmr->region to NULL after ib_umem_release.

Fixed: 5ac388db27c4 ("RDMA/irdma: Add support to re-register a memory region")

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0c5d70bcb9d2275a1c8515a924016fcfeb4ab441Refgit.kernel.org/stable/c/0f22c32141acdcda266b26cab2b830baf870f3e0Refgit.kernel.org/stable/c/29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2Refgit.kernel.org/stable/c/62298a48f8b8788ad8b8464e6ffdf1ddebd2217eRefgit.kernel.org/stable/c/66964118f1f50ed85001c8fc9f7ab5bbdd021ee0

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43120?

CVE-2026-43120 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43120?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43120?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43120?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43120 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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