CVE-2026-63902
USB: serial: cypress_m8: validate interrupt packet headers
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 ]
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 27, 2026, 5:44 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the latest Linux kernel updates.
- Ensure the Cypress USB driver is up-to-date.
- Validate interrupt packet headers during data processing.
- Resubmit interrupt URBs using the retry path.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63902.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63902 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63902
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63902 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63902 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': 'fcef31a5a85ccf3c313449a866ec6ed7e4132425', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': 'aaa66708bfb1dca2acd219d1c1582f9f6d5492cb', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': 'be50533fe7068e86eb7adb81988e6d6a3f6dfe53', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '90664556916de22467097d4c8ceb716d597a5c32', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': 'ae03453f2c809ca3cf73753269fa6184dea7160f', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '4a4cb0021ebe1fcadb52e04d19ed8d71470a530b', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '9f9bfc80c67f35a275820da7e83a35dface08281', 'versionType': 'git'}], 'programFiles': ['drivers/usb/serial/cypress_m8.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.26'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.26', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/serial/cypress_m8.c'], 'defaultStatus': 'affected'}] Added 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 ] Added Reference https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed Added Reference https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b Added Reference https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32 Added Reference https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281 Added Reference https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb Added Reference https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f Added Reference https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53 Added Reference https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425