CVE-2025-38110net/mdiobus: Fix potential out-of-bounds clause 45 read/write access
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In the Linux kernel, the following vulnerability has been resolved: net/mdiobus: Fix potential out-of-bounds clause 45 read/write access When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via C45 (clause 45) 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 C45 read/write operation. While this excludes this access from any statistics, it improves security of read/write operation.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a before abb0605ca00979a49572a6516f6db22c3dc57223; from 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a before 31bf7b2b92563a352788cf9df3698682f659bacc; 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a builds before 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7; from 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a before 260388f79e94fb3026c419a208ece8358bb7b555 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.3 before 6.6.94; from 6.7 before 6.12.34; from 6.13 before 6.15.3; 6.16 | NVD |
References
- https://git.kernel.org/stable/c/abb0605ca00979a49572a6516f6db22c3dc57223patch
- https://git.kernel.org/stable/c/31bf7b2b92563a352788cf9df3698682f659baccpatch
- https://git.kernel.org/stable/c/4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7patch
- https://git.kernel.org/stable/c/260388f79e94fb3026c419a208ece8358bb7b555patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.