CVE-2026-64402: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer()

highCVSS 7.8CVE-2026-64402

CSIRTS triage

Other

What: An out-of-bounds write issue exists in smb_sync_perf_buffer() in coresight.
Who is affected: Deployments using the coresight ultrasoc-smb functionality.
Urgency: Remediation urgency is unclear due to unknown severity and no exploitation reported.
Action: Monitor for updates regarding this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64402

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-644020.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64402	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-64402: In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: F…nvd

Recent advisories for coresight

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-64402: In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: F…nvd · 2026-07-25
lowCVE-2026-46272: coresight: tmc-etr: Fix race condition between sysfs and perf modemsrc · 2026-06-09