CVE-2026-63903 Details
Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: belkin_sa: validate interrupt status length The Belkin interrupt callback treats interrupt data as a four-byte status report and reads LSR/MSR fields at offsets 2 and 3. The interrupt-in buffer length is derived from endpoint wMaxPacketSize, and short interrupt transfers may complete successfully with a smaller actual_length. Check the completed interrupt packet length before parsing status fields so short interrupt endpoints and short successful packets are ignored instead of causing out-of-bounds or stale status-byte reads. KASAN report as below: BUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback() Read of size 1 Call trace: belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202) __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630) dummy_timer() (?:?)
A vulnerability exists in the Belkin USB serial driver within the Linux kernel. The issue arises because the driver's interrupt callback misinterprets interrupt data as a four-byte status report, leading to potential out-of-bounds reads of status bytes. This flaw occurs because the interrupt-in buffer length is based on the endpoint's wMaxPacketSize, allowing short interrupt transfers to be processed incorrectly. The vulnerability has been addressed by adding a check for the actual length of the interrupt packet before parsing the status fields, ensuring that short transfers are ignored and do not cause invalid memory accesses. This vulnerability was reported using the Kernel Address Sanitizer (KASAN), which detected a slab-out-of-bounds error in the Belkin interrupt callback.
Users can upgrade to the patched version of the Linux kernel where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
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Affected Products
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 19, 2026 | New CVE Received | kernel.org |