CVE-2026-68365: USB: serial: io_edgeport: cap received transmit credits
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: ioedgeport: cap received transmit credits
The interrupt-status packet reports transmit credits returned by the device. edgeinterruptcallback() adds the 16-bit value to txCredits without checking maxTxCredits.
edgewrite() uses txCredits minus the software FIFO count as the amount of data that fits. Since the FIFO is allocated with maxTxCredits bytes, txCredits exceeding maxTxCredits can cause OOB write in ring buffer.
Cap accumulated credits at maxTxCredits. Conforming devices should never hit the cap.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2026-68365?
CVE-2026-68365 is a vulnerability in the Linux kernel related to managing transmit credits in the USB serial io_edgeport driver.
What is the severity of CVE-2026-68365?
CVE-2026-68365 has a risk score of 40, indicating a significant potential impact if exploited.
How do I fix CVE-2026-68365?
To fix CVE-2026-68365, update the Linux kernel to the latest version that addresses this vulnerability.
What systems are affected by CVE-2026-68365?
CVE-2026-68365 affects systems running vulnerable versions of the Linux kernel that utilize the USB serial io_edgeport driver.
Is CVE-2026-68365 remotely exploitable?
CVE-2026-68365 does not specify remote exploitability, but vulnerabilities in kernel drivers can potentially be leveraged for local privilege escalation.