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Fencer Vulns
high 7.8

CVE-2025-38110 json

net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

published 2025-07-03 16 mo ago modified 2026-10-15 24 d ago also EUVD-2025-19833

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.6.94, 6.12.34, 6.15.3, 6.16
  • linux Debian 14, Debian 13 6.12.35-1

debian advisories DEBIAN-CVE-2025-38110

  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1044.44
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1046.52
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1030.33
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1047.51

ubuntu advisories UBUNTU-CVE-2025-38110

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-570.30.1.el9_6
  • rv RHEL 9 5.14.0-570.30.1.el9_6
  • perf RHEL 9 5.14.0-570.30.1.el9_6
  • rtla RHEL 9 5.14.0-570.30.1.el9_6
  • libperf RHEL 9 5.14.0-570.30.1.el9_6
  • kernel-rt RHEL 9 5.14.0-570.30.1.el9_6
  • kernel-64k RHEL 9 5.14.0-570.30.1.el9_6
  • kernel-core RHEL 9 5.14.0-570.30.1.el9_6

red hat advisories RHSA-2025:11861RHSA-2025:11855RHSA-2025:11245

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1SUSE-SU-2025:20891-1SUSE-SU-2025:20890-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-55.24.1.el10_0
  • kernel AlmaLinux 9 5.14.0-570.30.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.30.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.30.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.30.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.30.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.30.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.30.1.el9_6

almalinux advisories ALSA-2025:11855ALSA-2025:11861

  • kernel Rocky Linux 9 5.14.0-570.30.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.24.1.el10_0

rocky linux advisories RLSA-2025:11861RLSA-2025:11855

  • kernel Azure Linux 3.0 6.6.96.1-1

azure linux advisories AZL-64586

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-38110 updated cvss 6.0

kernel: net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.77.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.77.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11245
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.30.1.el9_6, perf 5.14.0-570.30.1.el9_6, rtla 5.14.0-570.30.1.el9_6, python3-perf 5.14.0-570.30.1.el9_6, kernel-devel-matched 5.14.0-570.30.1.el9_6, kernel-64k-devel-matched 5.14.0-570.30.1.el9_6, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11861
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.24.1.el10_0, perf 6.12.0-55.24.1.el10_0, rtla 6.12.0-55.24.1.el10_0, python3-perf 6.12.0-55.24.1.el10_0, kernel-devel-matched 6.12.0-55.24.1.el10_0, kernel-64k-devel-matched 6.12.0-55.24.1.el10_0, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11855
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.77.1.el9_4, perf 5.14.0-427.77.1.el9_4, rtla 5.14.0-427.77.1.el9_4, kernel-devel-matched 5.14.0-427.77.1.el9_4, kernel-64k-devel-matched 5.14.0-427.77.1.el9_4, kernel-debug-devel-matched 5.14.0-427.77.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11245
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.30.1.el9_6, kernel-64k 5.14.0-570.30.1.el9_6, kernel-core 5.14.0-570.30.1.el9_6, kernel-tools 5.14.0-570.30.1.el9_6, kernel-modules 5.14.0-570.30.1.el9_6, kernel-64k-core 5.14.0-570.30.1.el9_6, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11861
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.24.1.el10_0, kernel-64k 6.12.0-55.24.1.el10_0, kernel-core 6.12.0-55.24.1.el10_0, kernel-tools 6.12.0-55.24.1.el10_0, kernel-modules 6.12.0-55.24.1.el10_0, kernel-64k-core 6.12.0-55.24.1.el10_0, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11855
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.77.1.el9_4, kernel 5.14.0-427.77.1.el9_4, kernel-64k 5.14.0-427.77.1.el9_4, kernel-core 5.14.0-427.77.1.el9_4, kernel-tools 5.14.0-427.77.1.el9_4, python3-perf 5.14.0-427.77.1.el9_4, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11245
show 9 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.30.1.el9_6
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11861
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.24.1.el10_0
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11855
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.30.1.el9_6, kernel-rt-64k 5.14.0-570.30.1.el9_6, kernel-rt-core 5.14.0-570.30.1.el9_6, kernel-rt-modules 5.14.0-570.30.1.el9_6, kernel-rt-64k-core 5.14.0-570.30.1.el9_6, kernel-rt-debug-core 5.14.0-570.30.1.el9_6, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11861
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.24.1.el10_0, kernel-rt-64k 6.12.0-55.24.1.el10_0, kernel-rt-core 6.12.0-55.24.1.el10_0, kernel-rt-modules 6.12.0-55.24.1.el10_0, kernel-rt-64k-core 6.12.0-55.24.1.el10_0, kernel-rt-debug-core 6.12.0-55.24.1.el10_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11855
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.77.1.el9_4, kernel-rt-core 5.14.0-427.77.1.el9_4, kernel-rt-modules 5.14.0-427.77.1.el9_4, kernel-rt-debug-core 5.14.0-427.77.1.el9_4, kernel-rt-modules-core 5.14.0-427.77.1.el9_4, kernel-rt-debug-modules 5.14.0-427.77.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11245
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.30.1.el9_6, kernel-rt-kvm 5.14.0-570.30.1.el9_6, kernel-rt-core 5.14.0-570.30.1.el9_6, kernel-rt-modules 5.14.0-570.30.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.30.1.el9_6, kernel-rt-debug-core 5.14.0-570.30.1.el9_6, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11861
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.24.1.el10_0, kernel-rt-kvm 6.12.0-55.24.1.el10_0, kernel-rt-core 6.12.0-55.24.1.el10_0, kernel-rt-modules 6.12.0-55.24.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.24.1.el10_0, kernel-rt-debug-core 6.12.0-55.24.1.el10_0, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11855
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.77.1.el9_4, kernel-rt-kvm 5.14.0-427.77.1.el9_4, kernel-rt-core 5.14.0-427.77.1.el9_4, kernel-rt-modules 5.14.0-427.77.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.77.1.el9_4, kernel-rt-debug-core 5.14.0-427.77.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module mdio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:11245
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.