CVE-2025-38183 net: lan743x: fix potential out-of-bounds write in lan743x_ptp_io_event_clock_get()
A local attacker can trigger an out-of-bounds write in the lan743x PTP driver, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38183?
CVE-2025-38183 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 4 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2025-38183?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-38183?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-38183 being exploited?
There is no known exploitation of CVE-2025-38183 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-64725, BELL-CVE-2025-38183, DEBIAN-CVE-2025-38183, GHSA-6vwp-vx4p-6qjm, ROOT-OS-DEBIAN-12-CVE-2025-38183, ROOT-OS-UBUNTU-2404-CVE-2025-38183 and 1 more.