NuytsTech Security

CVE-2025-38183

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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.

More information : https://git.kernel.org/stable/c/41017bd66c533f7af912c58273c7dfd5de0065d4

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