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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-63902 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: validate interrupt packet headers cypress_read_int_callback() parses the interrupt-in buffer according to the selected Cypress packet format. Format 1 has a two-byte status/count header and format 2 has a one-byte combined status/count header. The usb-serial core sizes the interrupt-in buffer from the endpoint descriptor's wMaxPacketSize, and successful interrupt transfers can complete short when URB_SHORT_NOT_OK is not set. Check that the completed packet contains the selected header before reading it. Malformed short reports are ignored and the interrupt URB is resubmitted through the existing retry path, preventing out-of-bounds header-byte reads. KASAN report as below: KASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0 Read of size 1 Call trace: cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009) __usb_hcd_giveback_urb() dummy_timer() [ johan: use constants in header length sanity checks ]


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed kernel.org
https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b kernel.org
https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32 kernel.org
https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281 kernel.org
https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb kernel.org
https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f kernel.org
https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53 kernel.org
https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-63902
NVD Published Date:
07/19/2026
NVD Last Modified:
07/19/2026
Source:
kernel.org