CVE-2026-64336
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.
CSIRTS triage
- What
- An information leak is fixed in the keyspan_pda driver.
- Who is affected
- Deployments using USB serial devices with the keyspan_pda driver.
- Urgency
- Remediation is important to protect sensitive information, with no known exploits.
- Action
- Apply the patch when it becomes available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Advisory coverage (2)
- unknownCVE-2026-64336: In the Linux kernel, the following vulnerability has been resolved: USB: serial: keyspan_pda: …nvd · 2026-07-25
- highCVE-2026-64336: USB: serial: keyspan_pda: fix information leakmsrc · 2026-07-14
External references
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