Bug 2502416 (CVE-2026-63898) - CVE-2026-63898 kernel: USB: serial: mct_u232: fix memory corruption with small endpoint
Summary: CVE-2026-63898 kernel: USB: serial: mct_u232: fix memory corruption with smal...
Keywords:
Status: NEW
Alias: CVE-2026-63898
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 16:06 UTC by OSIDB Bzimport
Modified: 2026-07-21 20:42 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-19 16:06:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

USB: serial: mct_u232: fix memory corruption with small endpoint

The driver overrides the maximum transfer size for a specific device
which only accepts 16 byte packets for its 32 byte bulk-out endpoint.

Make sure to never increase the maximum transfer size to prevent slab
corruption should a malicious device report a smaller endpoint max
packet size than expected.
Comment 1 Keith Grant 2026-07-21 20:41:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071943-CVE-2026-63898-d22a@gregkh/T
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