CVE-2026-63899
USB: serial: mxuport: fix memory corruption with small endpoint
Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.
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
- Update the Linux kernel to the latest stable version.
- Ensure bulk-out endpoint 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-2026-63899.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63899 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-2026-63899
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-2026-63899 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63899 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': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': '086b858b5f5125bc9d967ea2bd825f83d9f8f29d', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': '2f3661eb2446e1ef593da45e01a3b21a906768ec', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': 'ccbec56f2f9af008f1574335cc6a668f16603e47', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': 'be3a1ed4ae51fa8dde57383277d336ce834f2cd9', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': 'e906545641d34fb1a09a65b4b5cfdff40eb09681', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': '6c0cf56f00f280d72180bb6ce79741bc787a6269', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': 'b40166b4ef96067620a0f248e74ad9658c8f680c', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e', 'lessThan': '4085f0dbb1ce2251c9a5938d693de6593f0ab2bd', 'versionType': 'git'}], 'programFiles': ['drivers/usb/serial/mxuport.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.14', '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/mxuport.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size. Added Reference https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d Added Reference https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec Added Reference https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd Added Reference https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269 Added Reference https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c Added Reference https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9 Added Reference https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47 Added Reference https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681