PT-2026-61220 · Linux · Linux

CVE-2026-63903 · Published 2026-07-19 · Updated 2026-07-19

Mitre

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() (?:?)

Related Identifiers

CVE-2026-63903

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-63903 · Security Note
• https://git.kernel.org/stable/c/ffb739a49186ea784bbd9cb91b647f062395b419 · Note
• https://git.kernel.org/stable/c/f1617539ab90e67da788959bfd314076f093a11a · Note
• https://git.kernel.org/stable/c/22823a319fb2afdf02cacafbed8b613b757efbc8 · Note
• https://git.kernel.org/stable/c/db1e7eb6203d534dad64cac2c793b69e561e657b · Note
• https://git.kernel.org/stable/c/4ce058df2ee02cc2a0f0fd5cd64ce6f1482a0b65 · Note
• https://git.kernel.org/stable/c/f361359a952da15e70e693c2d7dca5c5843eae3e · Note
• https://git.kernel.org/stable/c/6a4602221cba7a738442328d66a2f0b1c9bf6e17 · Note
• https://git.kernel.org/stable/c/37e54d1b986df35c936d81e5b59a7aa3ec6938f0 · Note