CVE-2026-64336

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < b069b7029862fafaff331d4c664d97d4ae828d6daffected
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < e52ca411f50539ff1d0c877b9312771ca8a858c1affected
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < 2f7a6b8ab3845bd1da02604f1a874b52a4555a72affected
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < e1494191a3aac665d3a2fce16169a97c346253ecaffected
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < cf6ca0aefae03958cfb5b189b0adbfb25c06bfacaffected
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < d4b12b6b395e43a2b1d80be3745631fcaa9c047baffected
LinuxLinux034e38e8f68767fb5438ae3e608ee82919674177 < 6bfc8d01ac4068eced509f8fc74d0cd205e4dcecaffected
LinuxLinux5.11affected
LinuxLinux0 < 5.11unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc3 <= *unaffected

Weaknesses

References