CVE-2025-68288

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

usb: storage: Fix memory leak in USB bulk transport

A kernel memory leak was identified by the 'ioctl_sg01' test from Linux

Test Project (LTP). The following bytes were mainly observed: 0x53425355.

When USB storage devices incorrectly skip the data phase with status data,

the code extracts/validates the CSW from the sg buffer, but fails to clear

it afterwards. This leaves status protocol data in srb's transfer buffer,

such as the US_BULK_CS_SIGN 'USBS' signature observed here. Thus, this can

lead to USB protocols leaks to user space through SCSI generic (/dev/sg*)

interfaces, such as the one seen here when the LTP test requested 512 KiB.

Fix the leak by zeroing the CSW data in srb's transfer buffer immediately

after the validation of devices that skip data phase.

Note: Differently from CVE-2018-1000204, which fixed a big leak by zero-

ing pages at allocation time, this leak occurs after allocation, when USB

protoc

/// 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