What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-09-03

Description

In the Linux kernel, the following vulnerability has been resolved: usb: mtu3: unmap request DMA on queue failure mtu3_gadget_queue() maps the request before checking whether the QMU GPD ring can accept another transfer. the request is returned with -EAGAIN before it is linked on the endpoint request list if mtu3_prepare_transfer() fails. Normal completion and dequeue paths unmap requests from mtu3_req_complete(), but this error path never reaches that helper, so the DMA mapping is left active. Unmap the request before returning from the failed queue path.

Affected products

• Linux kernel: from 4.10 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39 — fixed in 5.10.261, 5.15.212, 6.1.178, 6.12.96, 6.18.39, 6.6.145

How to fix

Upgrade to a fixed version: Linux kernel 5.10.261, 5.15.212, 6.1.178, 6.12.96. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/00c3fef4c2dc2c7cbd8281f8fda09d1913420f09
• https://git.kernel.org/stable/c/0bddda5a11665c210339de76d27ebbd1a2e0b43c
• https://git.kernel.org/stable/c/3cee30f1138281a1d247bb053a1ad4f7c5b04e98
• https://git.kernel.org/stable/c/4183874b7925f4a98b400cf857bea26ee87da236
• https://git.kernel.org/stable/c/835b0596d4c9bdef93f842d8f826978fb4956b74
• https://git.kernel.org/stable/c/8c29d9cfab1c3cf0d0b7fcdf9255597be30aa3e1
• https://git.kernel.org/stable/c/e8f739a3860d043dcc135371637e82f53132efe5
• https://git.kernel.org/stable/c/f3c4026524d3660c73ef2838b99776d37631e039

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