CVE-2025-38183 Information

Jul 05, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

net: lan743x: fix potential out-of-bounds write in lan743x_ptp_io_event_clock_get()

Before calling lan743x_ptp_io_event_clock_get() the ‘channel’ value is checked against the maximum value of PCI11X1X_PTP_IO_MAX_CHANNELS(8). This seems correct and aligns with the PTP interrupt status register (PTP_INT_STS) specifications.

However lan743x_ptp_io_event_clock_get() writes to ptp->extts[] with only LAN743X_PTP_N_EXTTS(4) elements using channel as an index:

lan743x_ptp_io_event_clock_get(... u8 channel...)

    ...
    / Update Local timestamp /
    extts = &ptp->extts[channel];
    extts->ts.tv_sec = sec;
    ...

To avoid an out-of-bounds write and utilize all the supported GPIO inputs set LAN743X_PTP_N_EXTTS to 8.

Detected using the static analysis tool - Svace.

Reference

https://git.kernel.org/stable/c/41017bd66c533f7af912c58273c7dfd5de0065d4 https://git.kernel.org/stable/c/4da0d23516857230b8e9b3022e25422ee2e2ba80 https://git.kernel.org/stable/c/66bba1fd5bad548c03f7e42669a59f3f4d8211cc https://git.kernel.org/stable/c/e353b0854d3a1a31cb061df8d022fbfea53a0f24 https://git.kernel.org/stable/c/e8d48201a132f4aab31351c19a802c5a5ae820fa

CNNVD-202507-454 (Published: 2025-07-04)

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