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CVE-2026-64402

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer() When the SMB sink is used as a perf AUX sink, smb_update_buffe…

Published Jul 25, 2026EPSS 0.13%

Overview

CVE-2026-64402 is a high-severity vulnerability. It was published on July 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:

coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer()

When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls

smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring

buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is

handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages

normalization is only applied after the first loop iteration.

This leaves the initial page index underived from the buffer size, which

can result in an out-of-bounds write past dst_pages[] when head exceeds

the AUX buffer size.

Normalize head modulo the AUX buffer size before deriving the page index

and offset, mirroring tmc_etr_sync_perf_buffer().

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/38dbc8db8341ccdf8e1e1a067453d33ad751864bRefgit.kernel.org/stable/c/4c5a0a946373da99a80398289b28845b5ae40cd1Refgit.kernel.org/stable/c/661a019ac0413ecec9e5d1dfcc12fbca8e78d5fbRefgit.kernel.org/stable/c/98495b5a4d77dd22e106f462b76e1093a55b29a7Refgit.kernel.org/stable/c/daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64402?

CVE-2026-64402 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64402?

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-2026-64402?

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-2026-64402?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64402 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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