Description
The unimac_mdio_probe function in drivers/net/phy/mdio-bcm-unimac.c in the Linux kernel through 4.15.8 does not validate certain resource availability, which allows local users to cause a denial of service (NULL pointer dereference).
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.16.5-1 | — |
| Debian 13 | linux | 4.16.5-1 | — |
| Debian 12 | linux | 4.16.5-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-119.143 | USN-3619-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1054.63 | USN-3619-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.13.0-1014.17 | USN-3632-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.13.0-1013.17 | USN-3630-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.13.0-41.46~16.04.1 | USN-3630-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1021.26 | USN-3619-1 |
| Ubuntu 16.04 LTS | linux-oem | 4.13.0-1024.27 | USN-3630-2 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1087.95 | USN-3619-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1090.95 | USN-3619-1 |
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1016.16 | USN-3619-2 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-119.143~14.04.1 | USN-3619-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1008.10 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-docs +3 | 4.4.126-94.22.1 | SUSE-SU-2018:1048-1 |
| SLES 12 SP3 | kernel-source | 4.4.126-94.22.2 | SUSE-SU-2018:1048-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.73.1 | SUSE-SU-2018:1173-2, SUSE-SU-2018:1173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_21 | 1-3.3.1 | SUSE-SU-2018:1173-2, SUSE-SU-2018:1173-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | kernel-source | 4.4.126-94.22.2 | SUSE-SU-2018:1048-1 |
| SLES for SAP 12 SP3 | kernel-syms +1 | 4.4.126-94.22.1 | SUSE-SU-2018:1048-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.73.1 | SUSE-SU-2018:1173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_21 | 1-3.3.1 | SUSE-SU-2018:1173-1 |
| SLE Real Time 12 SP3 | kernel-rt +3 | 4.4.128-3.11.1 | SUSE-SU-2018:1217-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_11 | 1-4.5.1 | SUSE-SU-2018:1048-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.73.1 | SUSE-SU-2018:1173-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_21 | 1-3.3.1 | SUSE-SU-2018:1173-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.73.1 | SUSE-SU-2018:1173-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_21 | 1-3.3.1 | SUSE-SU-2018:1173-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kernel-source | 5.14.6-1.4 | openSUSE-SU-2024:13704-1, openSUSE-SU-2024:10728-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.192-147.314 | 1.0-0.amzn2 | ALAS2-2020-1480 |
| Amazon Linux 2 | perf +8 | 4.14.192-147.314.amzn2 | ALAS2-2020-1480 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.23.2.el7uek | ELSA-2019-4509, ELSA-2018-4307, ELSA-2018-4304 |
| Oracle Linux 7 | perf +5 | 4.14.35-1818.5.4.el7uek | ELSA-2019-4509, ELSA-2018-4304 |
Advisories 14
- USN-3619-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3632-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3619-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3630-2 linux-hwe, linux-gcp, linux-oem vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:1173-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13704-1 kernel-devel-longterm-6.6.17-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1217-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1173-2 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10728-1 kernel-devel-5.14.6-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1048-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2020-1480 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 19, 2024
- ELSA-2019-4509 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 15, 2019
- ELSA-2018-4307 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 11, 2018
- ELSA-2018-4304 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 11, 2018
References
- USN-3619-2 vendor-advisory
- USN-3630-2 vendor-advisory
- USN-3632-1 vendor-advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5
- https://github.com/torvalds/linux/commit/297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5
- USN-3630-1 vendor-advisory
- USN-3619-1 vendor-advisory
- 1040749 vdb-entry