Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Linux Linux — net/mdiobus: Fix potential out-of-bounds read/write access
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U H N H 7.1 .0019 8.8 —
AFFECTED
Product Versions Fixed
Linux 080bb352fad00d04995102f681b134e3754bfb6e – —
Linux 5.6 – 5.10.239
TIMELINE
Apr 16 Reserved by Linux
Jul 3 Published (CNA: Linux)
Jul 30 RESCORED — CVE-2025-38111 (Linux). CVSS 7.8 → 7.1 (NVD).
Description
In the Linux kernel, the following vulnerability has been resolved:
net/mdiobus: Fix potential out-of-bounds read/write access
When using publicly available tools like 'mdio-tools' to read/write data
from/to network interface and its PHY via mdiobus, there is no verification of
parameters passed to the ioctl and it accepts any mdio address.
Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define,
but it is possible to pass higher value than that via ioctl.
While read/write operation should generally fail in this case,
mdiobus provides stats array, where wrong address may allow out-of-bounds
read/write.
Fix that by adding address verification before read/write operation.
While this excludes this access from any statistics, it improves security of
read/write operation.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
| April 16, 2025 | Reserved | Reserved by Linux |
| July 3, 2025 | Published | Published (CNA: Linux) |
| July 30, 2026 | RESCORED | RESCORED — CVE-2025-38111 (Linux). CVSS 7.8 → 7.1 (NVD). |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
| Linux | Linux | — | 080bb352fad00d04995102f681b134e3754bfb6e | — |
| Linux | Linux | — | 5.6 | 5.10.239 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-38111 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.