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CVE-2026-53133

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Fix truncation for block sizes >= 4G When the iommu is used the linearization of the mapping can give a single block…

Published Jun 25, 2026CWE-681EPSS 0.13%

Overview

CVE-2026-53133 is a high-severity vulnerability. It was published on June 25, 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/umem: Fix truncation for block sizes >= 4G

When the iommu is used the linearization of the mapping can give a single

block that is very large split across multiple SG entries.

When __rdma_block_iter_next() reassembles the split SG entries it is

overflowing the 32 bit stack values and computed the wrong DMA addresses

for blocks after the truncation.

Use the right types to hold DMA addresses.

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/15fe76e23615f502d051ef0768f86babaf08746cRefgit.kernel.org/stable/c/2ff4b7817e5b78070c30f5fb5e678e452a2628b3Refgit.kernel.org/stable/c/8fe0231adebe086c8a459c790944ac026cd99c6eRefgit.kernel.org/stable/c/ac1aad8e1281534ce936c250f68084fc79c5469eRefgit.kernel.org/stable/c/afd35fec9297195b759078745549c2671223f24fRefgit.kernel.org/stable/c/baf8685bcf56dc1efb44b8f6a57c42516e549068Refgit.kernel.org/stable/c/cc644d5608e3b0dadc970bd6e6aa26b91ea07d0fRefgit.kernel.org/stable/c/dee2a49adeeb2a5e16a3fc858fa21b841c519802

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53133?

CVE-2026-53133 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53133?

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-2026-53133?

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-2026-53133?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53133 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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