Answer in brief
CVE-2026-64327 records a Unknown severity vulnerability in usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7b07a2a7ca02a20124b552be96c5a56910795488 <82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b || >=7b07a2a7ca02a20124b552be96c5a56910795488 <9e04055ab5fc0470a0031ee6934739f9aa8f34a5 || >=7b07a2a7ca02a20124b552be96c5a56910795488 <f99f32ea9aa976afcbec20647ed33b50a52002c1 || >=7b07a2a7ca02a20124b552be96c5a56910795488 <82cfd4739011bdc7e87b5d585703427e89ddfaa5 | 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b, 9e04055ab5fc0470a0031ee6934739f9aa8f34a5, f99f32ea9aa976afcbec20647ed33b50a52002c1, 82cfd4739011bdc7e87b5d585703427e89ddfaa5 |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64327 records a Unknown severity vulnerability in usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7b07a2a7ca02a20124b552be96c5a56910795488 <82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b || >=7b07a2a7ca02a20124b552be96c5a56910795488 <9e04055ab5fc0470a0031ee6934739f9aa8f34a5 || >=7b07a2a7ca02a20124b552be96c5a56910795488 <f99f32ea9aa976afcbec20647ed33b50a52002c1 || >=7b07a2a7ca02a20124b552be96c5a56910795488 <82cfd4739011bdc7e87b5d585703427e89ddfaa5 | 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b, 9e04055ab5fc0470a0031ee6934739f9aa8f34a5, f99f32ea9aa976afcbec20647ed33b50a52002c1, 82cfd4739011bdc7e87b5d585703427e89ddfaa5 |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.