Medium 5.5Published Jul 25, 2026

CVE-2026-64336USB: serial: keyspan_pda: fix information leak

Updated under an hour ago (Oct 26, 2026, 8:23 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 034e38e8f68767fb5438ae3e608ee82919674177 before b069b7029862fafaff331d4c664d97d4ae828d6d; from 034e38e8f68767fb5438ae3e608ee82919674177 before e52ca411f50539ff1d0c877b9312771ca8a858c1; 034e38e8f68767fb5438ae3e608ee82919674177 builds before 2f7a6b8ab3845bd1da02604f1a874b52a4555a72; from 034e38e8f68767fb5438ae3e608ee82919674177 before e1494191a3aac665d3a2fce16169a97c346253ec; from 034e38e8f68767fb5438ae3e608ee82919674177 before cf6ca0aefae03958cfb5b189b0adbfb25c06bfac; from 034e38e8f68767fb5438ae3e608ee82919674177 before d4b12b6b395e43a2b1d80be3745631fcaa9c047b; 034e38e8f68767fb5438ae3e608ee82919674177 builds before 6bfc8d01ac4068eced509f8fc74d0cd205e4dcec; 02407bc7d42347da7ed2a3926a0b824bfc614914; and 1 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 7.2; 7.2	NVD

References

References

https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d	patch
https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1	patch
https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72	patch
https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec	patch
https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac	patch
https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b	patch
https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.