Description
ext4_protect_reserved_inode in fs/ext4/block_validity.c in the Linux kernel through 5.5.3 allows attackers to cause a denial of service (soft lockup) via a crafted journal size.
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 | 5.5.13-1 | — |
| Debian 13 | linux | 5.5.13-1 | — |
| Debian 12 | linux | 5.5.13-1 | — |
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 +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-96.97 | USN-4318-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1065.69 | USN-4324-1 |
| Ubuntu 18.04 LTS | linux-aws-5.3 | 5.3.0-1017.18~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1020.21~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1018.19~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1057.60 | USN-4324-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1035.36 | USN-4344-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-51.44~18.04.2 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1058.59 | USN-4324-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1079.89 | USN-4324-1 |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1050.55 | USN-4344-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1037.41 | USN-4324-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.3 | 5.3.0-1016.18~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1060.64 | USN-4324-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1023.25~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1076.83 | USN-4324-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-185.215 | USN-4419-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1110.121 | USN-4419-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1065.69~16.04.1 | USN-4324-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1077.82 | USN-4324-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1060.64 | USN-4324-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-96.97~16.04.1 | USN-4318-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1076.83 | USN-4419-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1037.41~16.04.1 | USN-4324-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1135.144 | USN-4419-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1139.147 | USN-4419-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1042.47 | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1074.78 | USN-4419-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1077.82~14.04.1 | USN-4324-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-185.215~14.04.1 | USN-4419-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.27.1 | SUSE-SU-2020:0511-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.34.1 | SUSE-SU-2020:0560-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.10.1 | SUSE-SU-2020:0558-1 |
| SLES 12 SP5 | kernel-docs | 4.12.14-122.17.2 | SUSE-SU-2020:0580-1 |
| SLES 12 SP5 | kernel-syms +3 | 4.12.14-122.17.1 | SUSE-SU-2020:0580-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.37.1 | SUSE-SU-2020:0559-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.48.1 | SUSE-SU-2020:0584-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| 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 | 4.12.14-16.10.1 | SUSE-SU-2020:0558-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.17.1 | SUSE-SU-2020:0580-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.37.1 | SUSE-SU-2020:0559-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.48.1 | SUSE-SU-2020:0584-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.5.1 | SUSE-SU-2020:0667-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.15.1 | SUSE-SU-2020:0649-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.34.1 | SUSE-SU-2020:0560-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_9 | 1-3.5.1 | SUSE-SU-2020:0560-1 |
| 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 | 4.12.14-122.17.1 | SUSE-SU-2020:0580-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_3 | 1-8.5.1 | SUSE-SU-2020:0580-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.48.1 | SUSE-SU-2020:0584-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_12 | 1-6.3.1 | SUSE-SU-2020:0584-1 |
| 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 | 4.12.14-14.20.1 | SUSE-SU-2020:0688-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | kernel-docs +8 | 4.12.14-lp151.28.40.1 | openSUSE-SU-2020:0336-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +4 | 5.4.17-2011.1.2.el8uek | ELSA-2020-5663 |
| Oracle Linux 7 | perf +3 | 5.4.17-2011.1.2.el7uek | ELSA-2020-5663 |
Advisories 19
- USN-4318-1 linux, linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4344-1 linux-gke-5.0, linux-oem-osp11 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4342-1 linux, linux-aws, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2, linux-raspi2-5.3 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4419-1 linux, linux-lts-xenial, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4324-1 linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- SUSE-SU-2020:0649-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1255-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0584-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0559-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0580-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0336-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0560-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0558-1 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-2020:0511-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0688-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0667-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:1275-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2020-5663 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 27, 2020
References
- https://patchwork.ozlabs.org/patch/1236118/
- https://security.netapp.com/advisory/ntap-20200313-0003/
- openSUSE-SU-2020:0336 vendor-advisory
- USN-4318-1 vendor-advisory
- USN-4324-1 vendor-advisory
- USN-4344-1 vendor-advisory
- USN-4342-1 vendor-advisory
- USN-4419-1 vendor-advisory