CVE-2026-64336
Published: July 29, 2026Last modified: August 14, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.182-r0) |
| 25 LTS | linux-lts | Fixed (6.12.103-r0) | |
| Stream | linux-lts | Fixed (6.18.43-r0) |
References
- https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72
- https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec
- https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d
- https://git.kernel.org/stable/c/cccef1711efbcdbe999738ac27d37b9ef6271abd
- https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac
- https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b
- https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec
- https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1