Linux: Out-of-bounds Read
CVE-2025-38110 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions abb0605ca00979a49572a6516f6db22c3dc57223, 31bf7b2b92563a352788cf9df3698682f659bacc, 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to abb0605ca00979a49572a6516f6db22c3dc57223 or 31bf7b2b92563a352788cf9df3698682f659bacc or 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7 or 260388f79e94fb3026c419a208ece8358bb7b555, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.6.94 or 6.12.34 or 6.15.3, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a up to, but not including, abb0605ca00979a49572a6516f6db22c3dc57223; 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a up to, but not including, 31bf7b2b92563a352788cf9df3698682f659bacc; 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a up to, but not including, 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7; 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a up to, but not including, 260388f79e94fb3026c419a208ece8358bb7b555; 6.3 | abb0605ca00979a49572a6516f6db22c3dc57223, 31bf7b2b92563a352788cf9df3698682f659bacc, 4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7, 260388f79e94fb3026c419a208ece8358bb7b555 |
| Linux | Linux Kernel | 6.3 up to, but not including, 6.6.94; 6.7 up to, but not including, 6.12.34; 6.13 up to, but not including, 6.15.3; 6.16 | 6.6.94, 6.12.34, 6.15.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 8.4 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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