CVE-2026-64336
USB: serial: keyspan_pda: fix information leak
Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: keyspan_pda: fix information leak The write() callback is supposed to return the number of characters accepted or a negative errno. Since the addition of write fifo support the keyspan_pda implementation will however return the number characters submitted to the device if the write urb is not already in use. If this number is larger than the number of characters passed to write(), the line discipline continues writing data from beyond the tty write buffer. Fix the information leak by making sure that keyspan_pda_write_start() returns zero on success as intended.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to include the fix.
- Ensure the write function returns zero on success.
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-2026-64336.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64336 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-2026-64336
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-2026-64336 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64336 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.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'b069b7029862fafaff331d4c664d97d4ae828d6d', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'e52ca411f50539ff1d0c877b9312771ca8a858c1', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': '2f7a6b8ab3845bd1da02604f1a874b52a4555a72', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'e1494191a3aac665d3a2fce16169a97c346253ec', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'cf6ca0aefae03958cfb5b189b0adbfb25c06bfac', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'd4b12b6b395e43a2b1d80be3745631fcaa9c047b', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': '6bfc8d01ac4068eced509f8fc74d0cd205e4dcec', 'versionType': 'git'}], 'programFiles': ['drivers/usb/serial/keyspan_pda.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/serial/keyspan_pda.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'b069b7029862fafaff331d4c664d97d4ae828d6d', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'e52ca411f50539ff1d0c877b9312771ca8a858c1', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': '2f7a6b8ab3845bd1da02604f1a874b52a4555a72', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'e1494191a3aac665d3a2fce16169a97c346253ec', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'cf6ca0aefae03958cfb5b189b0adbfb25c06bfac', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'd4b12b6b395e43a2b1d80be3745631fcaa9c047b', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': '6bfc8d01ac4068eced509f8fc74d0cd205e4dcec', 'versionType': 'git'}], 'programFiles': ['drivers/usb/serial/keyspan_pda.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/serial/keyspan_pda.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 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': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'b069b7029862fafaff331d4c664d97d4ae828d6d', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'e52ca411f50539ff1d0c877b9312771ca8a858c1', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': '2f7a6b8ab3845bd1da02604f1a874b52a4555a72', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'e1494191a3aac665d3a2fce16169a97c346253ec', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'cf6ca0aefae03958cfb5b189b0adbfb25c06bfac', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': 'd4b12b6b395e43a2b1d80be3745631fcaa9c047b', 'versionType': 'git'}, {'status': 'affected', 'version': '034e38e8f68767fb5438ae3e608ee82919674177', 'lessThan': '6bfc8d01ac4068eced509f8fc74d0cd205e4dcec', 'versionType': 'git'}], 'programFiles': ['drivers/usb/serial/keyspan_pda.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/serial/keyspan_pda.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: USB: serial: keyspan_pda: fix information leak The write() callback is supposed to return the number of characters accepted or a negative errno. Since the addition of write fifo support the keyspan_pda implementation will however return the number characters submitted to the device if the write urb is not already in use. If this number is larger than the number of characters passed to write(), the line discipline continues writing data from beyond the tty write buffer. Fix the information leak by making sure that keyspan_pda_write_start() returns zero on success as intended. Added Reference https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72 Added Reference https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec Added Reference https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d Added Reference https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac Added Reference https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b Added Reference https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec Added Reference https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1