PT-2026-64557 · Linux · Linux

CVE-2026-64336 · Published 2026-07-25 · Updated 2026-07-25

Mitre

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.

Related Identifiers

CVE-2026-64336

Affected Products

Linux

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-64336 · Security Note
• https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac · Note
• https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b · Note
• https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1 · Note
• https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec · Note
• https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d · Note
• https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec · Note
• https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72 · Note