CVE-2026-64336

USB: serial: keyspan_pda: fix information leak

State: Published
Severity: Not scored
Published: Jul 25, 2026
Updated: Sep 14, 2026
Reserved: Jul 19, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	034e38e8f68767fb5438ae3e608ee82919674177 to before b069b7029862fafaff331d4c664d97d4ae828d6dAffected 034e38e8f68767fb5438ae3e608ee82919674177 to before e52ca411f50539ff1d0c877b9312771ca8a858c1Affected 034e38e8f68767fb5438ae3e608ee82919674177 to before 2f7a6b8ab3845bd1da02604f1a874b52a4555a72Affected 034e38e8f68767fb5438ae3e608ee82919674177 to before e1494191a3aac665d3a2fce16169a97c346253ecAffected 034e38e8f68767fb5438ae3e608ee82919674177 to before cf6ca0aefae03958cfb5b189b0adbfb25c06bfacAffected 034e38e8f68767fb5438ae3e608ee82919674177 to before d4b12b6b395e43a2b1d80be3745631fcaa9c047bAffected 034e38e8f68767fb5438ae3e608ee82919674177 to before 6bfc8d01ac4068eced509f8fc74d0cd205e4dcecAffected 02407bc7d42347da7ed2a3926a0b824bfc614914Affected 5.10.266 to before 5.11Affected
LinuxLinux	5.11Affected before 5.11Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.96 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

034e38e8f68767fb5438ae3e608ee82919674177 to before b069b7029862fafaff331d4c664d97d4ae828d6dAffected
034e38e8f68767fb5438ae3e608ee82919674177 to before e52ca411f50539ff1d0c877b9312771ca8a858c1Affected
034e38e8f68767fb5438ae3e608ee82919674177 to before 2f7a6b8ab3845bd1da02604f1a874b52a4555a72Affected
034e38e8f68767fb5438ae3e608ee82919674177 to before e1494191a3aac665d3a2fce16169a97c346253ecAffected
034e38e8f68767fb5438ae3e608ee82919674177 to before cf6ca0aefae03958cfb5b189b0adbfb25c06bfacAffected
034e38e8f68767fb5438ae3e608ee82919674177 to before d4b12b6b395e43a2b1d80be3745631fcaa9c047bAffected
034e38e8f68767fb5438ae3e608ee82919674177 to before 6bfc8d01ac4068eced509f8fc74d0cd205e4dcecAffected
02407bc7d42347da7ed2a3926a0b824bfc614914Affected
5.10.266 to before 5.11Affected

LinuxLinux

5.11Affected
before 5.11Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.96 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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