CVE-2026-64337: usb: mtu3: unmap request DMA on queue failure

highCVSS 7.1CVE-2026-64337

CSIRTS triage

vendor: Linux product: mtu3Other

What: A vulnerability exists in the mtu3 driver related to unmapping request DMA on queue failure.
Who is affected: Deployments of the mtu3 driver are affected.
Urgency: Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.
Action: Update to the latest version of the mtu3 driver.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.1
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64337

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-2026-643370.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64337	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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Recent advisories for usb

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.

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unknownCVE-2026-64594: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: initial…nvd · 2026-08-06
unknownCVE-2026-64585: In the Linux kernel, the following vulnerability has been resolved: can: esd_usb: kill anchore…nvd · 2026-08-06
unknownCVE-2026-64584: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: cance…nvd · 2026-08-06
unknownCVE-2026-64583: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: udc: bdc: fre…nvd · 2026-08-06
mediumCVE-2026-64585: can: esd_usb: kill anchored URBs before freeing netdevsmsrc · 2026-08-06