Description
A memory out-of-bounds read flaw was found in the Linux kernel before 5.9-rc2 with the ext3/ext4 file system, in the way it accesses a directory with broken indexing. This flaw allows a local user to crash the system if the directory exists. The highest threat from this vulnerability is to system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux Kernel | kernel | before 5.9-rc2 | — |
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 | 5.8.7-1 | — |
| Debian 13 | linux | 5.8.7-1 | — |
| Debian 12 | linux | 5.8.7-1 | — |
| Debian 9 | linux | 4.9.240-1 | DLA-2420-1 |
| Debian 9 | linux-4.19 | 4.19.146-1~deb9u1 | DLA-2385-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-51.56 | USN-4576-1 |
| Ubuntu 20.04 LTS | linux-aws +2 | 5.4.0-1028.29 | USN-4576-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1031.32 | USN-4576-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1026.27 | USN-4576-1 |
| Ubuntu 20.04 LTS | linux-oem-5.6 | 5.6.0-1048.52 | USN-4752-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1021.24 | USN-4576-1 |
| Ubuntu 20.04 LTS | linux-raspi2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv | 5.4.0-36.41 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-121.123 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1086.91 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 +2 | 5.4.0-1028.29~18.04.1 | USN-4576-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1099.110 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1031.32~18.04.1 | USN-4576-1 |
| Ubuntu 18.04 LTS | linux-gcp +11 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1086.98 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1072.76 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1027.28~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1003.3 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-51.56~18.04.1 | USN-4576-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1077.79 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1099.109 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1057.62 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1021.24~18.04.1 | USN-4576-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1073.78 | USN-4578-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1089.98 | USN-4578-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-193.224 | USN-4579-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1117.131 | USN-4579-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1085.90~16.04.1 | USN-4578-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1098.109~16.04.1 | USN-4578-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1086.98~16.04.1 | USN-4578-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-120.122~16.04.1 | USN-4578-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1082.91 | USN-4579-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1056.61~16.04.1 | USN-4578-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1141.151 | USN-4579-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1145.155 | USN-4579-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2030.31 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2012.14 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1044.50 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1048.53 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1081.85 | USN-4579-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1098.109~14.04.1 | USN-4578-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-193.224~14.04.1 | USN-4579-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-305.rt7.72.el8 | RHSA-2021:1739 |
| RHEL 8 | perf +26 | 4.18.0-305.el8 | RHSA-2021:1578 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.11.1.rt56.1145.el7 | RHSA-2020:5441 |
| RHEL 7 | perf +18 | 3.10.0-1160.11.1.el7 | RHSA-2020:5437 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-tools-libs-devel | 4.18.0-305.el8 | ALSA-2021:1578 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.15.1 | SUSE-SU-2020:2485-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.12.1.9.4.1 | SUSE-SU-2020:2486-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.12.1 | SUSE-SU-2020:2486-1 |
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.41.1 | SUSE-SU-2020:2541-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.56.1 | SUSE-SU-2020:2575-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.58.1 | SUSE-SU-2020:2610-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.25.1 | SUSE-SU-2020:2540-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.37.1 | SUSE-SU-2020:2574-1 |
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.60.1 | SUSE-SU-2020:2623-1 |
Show 22 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.130.1 | SUSE-SU-2020:2582-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_35 | 1-4.3.1 | SUSE-SU-2020:2582-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.141.1 | SUSE-SU-2020:2576-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_37 | 1-3.3.1 | SUSE-SU-2020:2576-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.58.1 | SUSE-SU-2020:2610-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.25.1 | SUSE-SU-2020:2540-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.37.1 | SUSE-SU-2020:2574-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.60.1 | SUSE-SU-2020:2623-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.130.1 | SUSE-SU-2020:2582-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_35 | 1-4.3.1 | SUSE-SU-2020:2582-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.141.1 | SUSE-SU-2020:2576-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_37 | 1-3.3.1 | SUSE-SU-2020:2576-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.16.1 | SUSE-SU-2020:2605-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.12.1 | SUSE-SU-2020:2486-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_2 | 1-5.3.1 | SUSE-SU-2020:2486-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.56.1 | SUSE-SU-2020:2575-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_15 | 1-3.3.2 | SUSE-SU-2020:2575-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.58.1 | SUSE-SU-2020:2610-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_20 | 1-1.3.1 | SUSE-SU-2020:2610-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.37.1 | SUSE-SU-2020:2574-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_9 | 1-8.5.1 | SUSE-SU-2020:2574-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.60.1 | SUSE-SU-2020:2623-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_16 | 1-6.3.1 | SUSE-SU-2020:2623-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.58.1 | SUSE-SU-2020:2610-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.31.1 | SUSE-SU-2020:2631-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.60.1 | SUSE-SU-2020:2623-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.130.1 | SUSE-SU-2020:2582-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_35 | 1-4.3.1 | SUSE-SU-2020:2582-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.60.1 | SUSE-SU-2020:2623-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.130.1 | SUSE-SU-2020:2582-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_35 | 1-4.3.1 | SUSE-SU-2020:2582-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.141.1 | SUSE-SU-2020:2576-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_37 | 1-3.3.1 | SUSE-SU-2020:2576-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.130.1 | SUSE-SU-2020:2582-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_35 | 1-4.3.1 | SUSE-SU-2020:2582-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.130.1 | SUSE-SU-2020:2582-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_35 | 1-4.3.1 | SUSE-SU-2020:2582-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.41.1.lp152.8.6.2 | openSUSE-SU-2020:1382-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.41.1 | openSUSE-SU-2020:1382-1 |
| 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 +8 | 4.12.14-lp151.28.63.1 | openSUSE-SU-2020:1325-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.198-152.320 | 1.0-0.amzn2 | ALAS2-2020-1495 |
| Amazon Linux 2 | perf +8 | 4.14.198-152.320.amzn2 | ALAS2-2020-1495 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-305.el8 | ELSA-2021-1578 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.50.1.el6uek | 0.4.5-3.el6 | ELSA-2020-5879 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.50.1.el7uek | 0.4.5-3.el7 | ELSA-2020-5879 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.50.1.el7uek | ELSA-2020-5885, ELSA-2020-5884, ELSA-2020-5879 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-2025.401.4.el7uek | ELSA-2020-5885, ELSA-2020-5884 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.11.1.el7 | ELSA-2020-5885, ELSA-2020-5884, ELSA-2020-5437 |
Advisories 34
- ALSA-2021:1578 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- USN-4578-1 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) · Sep 7, 2026
- USN-4579-1 linux, linux-aws, linux-kvm, linux-lts-xenial, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- RHSA-2021:1739 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2021:1578 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2020:5441 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:5437 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-4752-1 linux-oem-5.6 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4576-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2385-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2420-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:0242-1 Security update for RT kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2605-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2540-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2631-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2582-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2575-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2485-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2486-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1325-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2576-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2610-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2623-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1382-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2541-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2574-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2020-1495 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 29, 2023
- WID-SEC-2022-1615 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 22, 2023
- ELSA-2021-1578 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
- ELSA-2020-5437 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 16, 2020
- ELSA-2020-5885 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 12, 2020
- ELSA-2020-5884 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 12, 2020
- ELSA-2020-5879 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 9, 2020
- ELSA-2020-5866 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5872331b3d91820e14716632ebb56b1399b34fe1
- https://lore.kernel.org/linux-ext4/f53e246b-647c-64bb-16ec-135383c70ad7%40redhat.com/T/#u
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14314
- [debian-lts-announce] 20200928 [SECURITY] [DLA 2385-1] linux-4.19 security update mailing-list
- USN-4576-1 vendor-advisory
- USN-4578-1 vendor-advisory
- USN-4579-1 vendor-advisory
- [debian-lts-announce] 20201030 [SECURITY] [DLA 2420-1] linux security update mailing-list
- [debian-lts-announce] 20201031 [SECURITY] [DLA 2420-2] linux regression update mailing-list
- https://www.starwindsoftware.com/security/sw-20210325-0003/