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

usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks

When parsing endpoint descriptors, ffs_data_got_descs() generates the
eps_addrmap which contains the endpoint direction. However, epfile->in
was previously only populated in ffs_func_eps_enable() which executes
upon USB host connection. As a result, early userspace ioctls like
FUNCTIONFS_DMABUF_ATTACH that run before the host connects would see
epfile->in as 0, leading to incorrect DMA directions.

By moving the initialization to ffs_epfiles_create(), epfile->in is
accurate before userspace opens the endpoint files.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00209.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
7b07a2a7ca02a20124b552be96c5a56910795488 affected < 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b
7b07a2a7ca02a20124b552be96c5a56910795488 affected < 9e04055ab5fc0470a0031ee6934739f9aa8f34a5
7b07a2a7ca02a20124b552be96c5a56910795488 affected < f99f32ea9aa976afcbec20647ed33b50a52002c1
7b07a2a7ca02a20124b552be96c5a56910795488 affected < 82cfd4739011bdc7e87b5d585703427e89ddfaa5
Linux Linux affected
Version Status Constraints
6.9 affected —
0 unaffected < 6.9
6.12.96 unaffected ≤ 6.12.*
6.18.39 unaffected ≤ 6.18.*
7.1.4 unaffected ≤ 7.1.*
7.2-rc3 unaffected ≤ *

No data.

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b cve-icon
https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5 cve-icon
https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5 cve-icon
https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1 cve-icon
History

Sat, 25 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks When parsing endpoint descriptors, ffs_data_got_descs() generates the eps_addrmap which contains the endpoint direction. However, epfile->in was previously only populated in ffs_func_eps_enable() which executes upon USB host connection. As a result, early userspace ioctls like FUNCTIONFS_DMABUF_ATTACH that run before the host connects would see epfile->in as 0, leading to incorrect DMA directions. By moving the initialization to ffs_epfiles_create(), epfile->in is accurate before userspace opens the endpoint files.
Title usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-25T08:49:55.426Z

Reserved: 2026-07-19T15:36:31.780Z

Link: CVE-2026-64327

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-25T13:15:03Z

Weaknesses

No weakness.