CVE-2026-63956
USB: serial: cypress_m8: fix memory corruption with small endpoint
Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: fix memory corruption with small endpoint Make sure that the interrupt-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption or NULL-pointer dereference should a malicious device report a smaller size.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 30, 2026, 2:51 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the Linux kernel patch for the Cypress M8 USB driver.
- Ensure interrupt-out endpoint max packet size is at least eight bytes.
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-2026-63956.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63956 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-2026-63956
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-2026-63956 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63956 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': '4fcb22218f0a7229b7ce3b3952fb644def293fa5', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': 'ad3d1628a46134276546d7a12fedf04be9979158', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '52e18ae0c47c5c89e18fcd8022f287f7cc8802ec', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '4bcaa59f403dbde6328604a500d65ee8d40975d9', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '1ef25704bd3b625fd151c09feee459479f71ee64', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '284105c40fc31fff90cdab8a0377aaeb92f87f0e', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': '6c13f3bb652bc8665e709ba07122612586aea648', 'versionType': 'git'}, {'status': 'affected', 'version': '3416eaa1f8f8d516b77de514e14cf8da256d28fb', 'lessThan': 'e1a9d791fd66ab2431b9e6f6f835823809869047', '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: fix memory corruption with small endpoint Make sure that the interrupt-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption or NULL-pointer dereference should a malicious device report a smaller size. Added Reference https://git.kernel.org/stable/c/1ef25704bd3b625fd151c09feee459479f71ee64 Added Reference https://git.kernel.org/stable/c/284105c40fc31fff90cdab8a0377aaeb92f87f0e Added Reference https://git.kernel.org/stable/c/4bcaa59f403dbde6328604a500d65ee8d40975d9 Added Reference https://git.kernel.org/stable/c/4fcb22218f0a7229b7ce3b3952fb644def293fa5 Added Reference https://git.kernel.org/stable/c/52e18ae0c47c5c89e18fcd8022f287f7cc8802ec Added Reference https://git.kernel.org/stable/c/6c13f3bb652bc8665e709ba07122612586aea648 Added Reference https://git.kernel.org/stable/c/ad3d1628a46134276546d7a12fedf04be9979158 Added Reference https://git.kernel.org/stable/c/e1a9d791fd66ab2431b9e6f6f835823809869047