Bug 2521418 (CVE-2026-74681) - CVE-2026-74681 kernel: usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg
Summary: CVE-2026-74681 kernel: usb: misc: usbio: check ibuf_len against rxbuf_len in ...
Keywords:
Status: NEW
Alias: CVE-2026-74681
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-22 15:44 UTC by OSIDB Bzimport
Modified: 2026-08-24 16:40 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-08-22 15:44:37 UTC
In the Linux kernel, the following vulnerability has been resolved:

usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg

ibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check
in usbio_bulk_msg() compares it against txbuf_len — the bulk OUT
endpoint size.  Both are taken independently from different endpoints
in usbio_probe(), so the check is wrong when they differ.

Use rxbuf_len for the IN direction.  This matches the buffer that
actually holds the response data.

Comment 1 Mauro Matteo Cascella 2026-08-24 13:15:54 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082231-CVE-2026-74681-f31c@gregkh/T


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