Not yet scoredPublished Jul 19, 2026

CVE-2026-63902USB: serial: cypress_m8: validate interrupt packet headers

Updated under an hour ago (Oct 28, 2026, 8:20 AM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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 ]

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Awaiting Analysis
Record last updated: Jul 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 3416eaa1f8f8d516b77de514e14cf8da256d28fb before fcef31a5a85ccf3c313449a866ec6ed7e4132425; from 3416eaa1f8f8d516b77de514e14cf8da256d28fb before aaa66708bfb1dca2acd219d1c1582f9f6d5492cb; 3416eaa1f8f8d516b77de514e14cf8da256d28fb builds before 44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed; from 3416eaa1f8f8d516b77de514e14cf8da256d28fb before be50533fe7068e86eb7adb81988e6d6a3f6dfe53; from 3416eaa1f8f8d516b77de514e14cf8da256d28fb before 90664556916de22467097d4c8ceb716d597a5c32; from 3416eaa1f8f8d516b77de514e14cf8da256d28fb before ae03453f2c809ca3cf73753269fa6184dea7160f; 3416eaa1f8f8d516b77de514e14cf8da256d28fb builds before 4a4cb0021ebe1fcadb52e04d19ed8d71470a530b; 3416eaa1f8f8d516b77de514e14cf8da256d28fb builds before 9f9bfc80c67f35a275820da7e83a35dface08281	CNA record

References

References

https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425
https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb
https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed
https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53
https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32
https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f
https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b
https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.