net/mdiobus: Fix potential out-of-bounds clause 45 read/write access
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.
CVE-2025-38110
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38110
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a",
"lessThan": "abb0605ca00979a49572a6516f6db22c3dc57223",
"versionType": "git"
},
{
"status": "affected",
"version": "4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a",
"lessThan": "31bf7b2b92563a352788cf9df3698682f659bacc",
"versionType": "git"
},
{
"status": "affected",
"version": "4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a",
"lessThan": "4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7",
"versionType": "git"
},
{
"status": "affected",
"version": "4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a",
"lessThan": "260388f79e94fb3026c419a208ece8358bb7b555",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/phy/mdio_bus.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.94",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.34",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.3",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/phy/mdio_bus.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38110
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30521 · Revision 1
- Added to Heist Feed
- Publisher date