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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64327
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:14 UTC
Updated2026-08-17 05:17:33 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101990000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b git Not specified
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 9e04055ab5fc0470a0031ee6934739f9aa8f34a5 git Not specified
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 f99f32ea9aa976afcbec20647ed33b50a52002c1 git Not specified
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 82cfd4739011bdc7e87b5d585703427e89ddfaa5 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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