CVE-2025-38110net/mdiobus: Fix potential out-of-bounds clause 45 read/write access
- 7.8HighCVSS base score
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 3 months later
· 3 months later
Published
- 16 months later
· 16 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a – < abb0605ca00979a49572a6516f6db22c3dc57223
- affected 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a – < 31bf7b2b92563a352788cf9df3698682f659bacc
- affected 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a – < 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7
- affected 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a – < 260388f79e94fb3026c419a208ece8358bb7b555
- affected 6.3
- unaffected < 6.3
- unaffected 6.6.94 – ≤ 6.6.*
- unaffected 6.12.34 – ≤ 6.12.*
- unaffected 6.15.3 – ≤ 6.15.*
- unaffected 6.16 – ≤ *
References
References4
- https://git.kernel.org/stable/c/abb0605ca00979a49572a6516f6db22c3dc57223 (opens in a new tab)
- https://git.kernel.org/stable/c/31bf7b2b92563a352788cf9df3698682f659bacc (opens in a new tab)
- https://git.kernel.org/stable/c/4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7 (opens in a new tab)
- https://git.kernel.org/stable/c/260388f79e94fb3026c419a208ece8358bb7b555 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-19833 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-38110)Record last updated .