CVE-2026-63903

Last refreshed2026-10-30

Status: UPDATED | Advisory ID: CVE-2026-63903

Key Details

CVE	CVE-2026-63903
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-30
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-125 (Out-of-bounds Read)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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() (?:?) (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-63903
CVE	https://www.cve.org/CVERecord?id=CVE-2026-63903

Source

Reference

NVD

CVE