Description
relay_open in kernel/relay.c in the Linux kernel through 5.4.1 allows local users to cause a denial of service (such as relay blockage) by triggering a NULL alloc_percpu result.
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 | 5.6.14-2 | — |
| Debian 13 | linux | 5.6.14-2 | — |
| Debian 12 | linux | 5.6.14-2 | — |
| Debian 10 | linux | 4.19.118-2+deb10u1 | DSA-4699-1 |
| Debian 9 | linux | 4.9.210-1+deb9u1 | DSA-4698-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | linux-4.9 | 4.9.210-1+deb9u1~deb8u1 | DLA-2242-1 |
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 | 5.4.0-42.46 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-aws +1 | 5.4.0-1020.20 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1022.22 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-gcp +1 | 5.4.0-1021.21 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-gke +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-oem-5.6 | 5.6.0-1018.18 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1015.15 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-riscv | 5.4.0-30.34 | USN-4425-1 |
| Ubuntu 18.04 LTS | linux | 4.15.0-109.110 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1077.81 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-aws-5.3 | 5.3.0-1032.34~18.04.2 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1034.35~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1022.22~18.04.1 | USN-4425-1 |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1080.90 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1032.34~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1066.69 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1045.46 | USN-4439-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-64.58~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-42.46~18.04.1 | USN-4425-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1069.70 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-oem +1 | 4.15.0-1091.101 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1065.70 | USN-4439-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1048.52 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.3 | 5.3.0-1030.32~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1015.15~18.04.1 | USN-4425-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1065.69 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1030.32~18.04.2 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1083.91 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1079.83~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1091.101~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1080.90~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-112.113~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1050.54~16.04.1 | USN-4414-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2022.22 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1037.42 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1091.101~14.04.1 | USN-4414-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.5.1 | SUSE-SU-2020:2027-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.9.1.9.2.6 | SUSE-SU-2020:2105-1 |
| SLES 15 SP2 | kernel-docs | 5.3.18-24.9.2 | SUSE-SU-2020:2105-1 |
| SLES 15 SP2 | kernel-syms +4 | 5.3.18-24.9.1 | SUSE-SU-2020:2105-1 |
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.33.1 | SUSE-SU-2020:1604-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.45.1 | SUSE-SU-2020:1599-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.16.1 | SUSE-SU-2020:1587-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.23.1 | SUSE-SU-2020:1602-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.43.1 | SUSE-SU-2020:1603-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.54.1 | SUSE-SU-2020:1605-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.16.1 | SUSE-SU-2020:1587-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.23.1 | SUSE-SU-2020:1602-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.43.1 | SUSE-SU-2020:1603-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.54.1 | SUSE-SU-2020:1605-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.13.1 | SUSE-SU-2020:2478-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.23.1 | SUSE-SU-2020:2156-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.9.1 | SUSE-SU-2020:2105-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_1 | 1-5.3.6 | SUSE-SU-2020:2105-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.45.1 | SUSE-SU-2020:1599-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_12 | 1-3.5.1 | SUSE-SU-2020:1599-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_18 | 1-1.5.1 | SUSE-SU-2020:1663-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.23.1 | SUSE-SU-2020:1602-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_5 | 1-8.3.1 | SUSE-SU-2020:1602-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.54.1 | SUSE-SU-2020:1605-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_14 | 1-6.3.1 | SUSE-SU-2020:1605-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.28.1 | SUSE-SU-2020:2487-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.26.2.lp152.8.2.2 | openSUSE-SU-2020:0935-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.26.2 | openSUSE-SU-2020:0935-1 |
| openSUSE Leap 15.2 | kernel-rt +3 | 5.3.18-lp152.3.5.1 | openSUSE-SU-2021:0242-1 |
| openSUSE Leap 15.1 | kernel-docs | 4.12.14-lp151.28.52.2 | openSUSE-SU-2020:0801-1 |
| openSUSE Leap 15.1 | kernel-obs-qa +1 | 4.12.14-lp151.28.52.3 | openSUSE-SU-2020:0801-1 |
| openSUSE Leap 15.1 | kernel-syms +5 | 4.12.14-lp151.28.52.1 | openSUSE-SU-2020:0801-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.186-146.268 | 1.0-0.amzn2 | ALAS2-2020-1465 |
| Amazon Linux 2 | perf +8 | 4.14.186-146.268.amzn2 | ALAS2-2020-1465 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +10 | 4.14.35-1902.302.2.el7uek | ELSA-2020-5805, ELSA-2020-5676 |
Advisories 25
- USN-4440-1 linux-hwe, linux-aws-5.3, linux-azure-5.3, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-oracle-5.3, linux-raspi2-5.3 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4425-1 linux, linux-aws, linux-azure, linux-azure-5.4, linux-gcp, linux-hwe-5.4, linux-kvm, linux-oracle, linux-raspi, linux-raspi-5.4, linux-riscv vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4414-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4439-1 linux-gke-5.0, linux-oem-osp1 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-4698-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4699-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2242-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:2105-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0801-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0242-1 Security update for RT kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2156-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2487-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0935-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1603-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2478-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1663-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1587-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1604-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1602-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1599-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2027-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1605-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2020-1465 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 17, 2023
- ELSA-2020-5805 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 10, 2020
- ELSA-2020-5676 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 11, 2020
References
- https://syzkaller-ppc64.appspot.com/bug?id=1c09906c83a8ea811a9e318c2a4f8e243becc6f8
- https://syzkaller-ppc64.appspot.com/bug?id=b05b4d005191cc375cdf848c3d4d980308d50531
- https://syzkaller.appspot.com/bug?id=e4265490d26d6c01cd9bc79dc915ef0a1bf15046
- https://syzkaller.appspot.com/bug?id=f4d1cb4330bd3ddf4a628332b4285407b2eedd7b
- https://lore.kernel.org/lkml/20191129013745.7168-1-dja%40axtens.net/
- [debian-lts-announce] 20200610 [SECURITY] [DLA 2242-1] linux-4.9 security update mailing-list
- DSA-4698 vendor-advisory
- DSA-4699 vendor-advisory
- openSUSE-SU-2020:0801 vendor-advisory
- openSUSE-SU-2020:0935 vendor-advisory
- USN-4414-1 vendor-advisory
- USN-4425-1 vendor-advisory
- USN-4439-1 vendor-advisory
- USN-4440-1 vendor-advisory
- https://security.netapp.com/advisory/ntap-20210129-0004/