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OpenAdvisories
Medium · 4.4 CVE-2020-11935 EUVD-2020-4272GHSA-m5wq-r6hh-xqf5

aufs: improperly managed inode reference counts in the vfsub_dentry_open() method

Published Apr 7, 2023 · Updated Aug 4, 2024 · Assigned by canonical

Vendor: Ubuntu Product: Linux kernel (aufs filesystem module) Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-7.0 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-7.0 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.15 Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.17 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fde-7.0 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-7.0 Package: linux-gcp-edge Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.0 Package: linux-gke-5.15 Package: linux-gke-5.3 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.17 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-7.0 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-6.8 Package: linux-intel Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-7.0 Package: linux-nvidia-bos Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oem-7.0 Package: linux-oem-osp1 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-oracle-7.0 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-raspi2-5.3 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.17 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-riscv-7.0 Package: linux-snapdragon Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Ubuntu

Description

It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.

Affected products

VendorProductAffectedFixed
Ubuntu Linux kernel (aufs filesystem module) — —

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.

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield No fix yet —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield No fix yet —
Ubuntu 26.10 linux +8 No fix yet —
Ubuntu 26.04 LTS linux +14 No fix yet —
Ubuntu 25.10 linux +8 No fix yet —
Show 20 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS linux +53 No fix yet —
Ubuntu 22.04 LTS linux +59 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-raspi 5.4.0-1015.15 USN-4425-1
Ubuntu 20.04 LTS linux-raspi2 +23 No fix yet —
Ubuntu 20.04 LTS linux-riscv 5.4.0-30.34 USN-4425-1
Ubuntu 18.04 LTS linux 4.15.0-112.113 USN-4426-1
Ubuntu 18.04 LTS linux-aws 4.15.0-1079.83 USN-4426-1
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-4.15 4.15.0-1092.102 USN-4426-1
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-4426-1
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-4426-1
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 4.15.0-1071.72 USN-4426-1
Ubuntu 18.04 LTS linux-oem 4.15.0-1093.103 USN-4426-1
Ubuntu 18.04 LTS linux-oem-osp1 5.0.0-1065.70 USN-4439-1
Ubuntu 18.04 LTS linux-oracle 4.15.0-1050.54 USN-4426-1
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 4.15.0-1067.71 USN-4426-1
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-4426-1
Ubuntu 16.04 LTS linux 4.4.0-186.216 USN-4427-1
Ubuntu 16.04 LTS linux-aws 4.4.0-1111.123 USN-4427-1
Ubuntu 16.04 LTS linux-aws-hwe 4.15.0-1079.83~16.04.1 USN-4426-1
Ubuntu 16.04 LTS linux-azure 4.15.0-1092.102~16.04.1 USN-4426-1
Ubuntu 16.04 LTS linux-gcp 4.15.0-1080.90~16.04.1 USN-4426-1
Ubuntu 16.04 LTS linux-hwe 4.15.0-112.113~16.04.1 USN-4426-1
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu 16.04 LTS linux-kvm 4.4.0-1077.84 USN-4427-1
Ubuntu 16.04 LTS linux-oracle 4.15.0-1050.54~16.04.1 USN-4426-1
Ubuntu 16.04 LTS linux-raspi2 4.4.0-1136.145 USN-4427-1
Ubuntu 16.04 LTS linux-snapdragon 4.4.0-1140.148 USN-4427-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime +3 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-realtime +2 No fix yet —
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 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 24.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux 5.4.0-42.46 LSN-0072-1, LSN-0070-1
Ubuntu Pro 20.04 LTS linux-aws 5.4.0-1020.20 LSN-0072-1, LSN-0070-1
Ubuntu Pro 20.04 LTS linux-aws-5.15 +10 No fix yet —
Ubuntu Pro 20.04 LTS linux-azure 5.4.0-1022.22 LSN-0072-1, LSN-0070-1
Ubuntu Pro 20.04 LTS linux-gcp 5.4.0-1021.21 LSN-0072-1, LSN-0070-1
Ubuntu Pro 18.04 LTS linux 4.15.0-112.113 LSN-0072-1, LSN-0070-1
Ubuntu Pro 18.04 LTS linux-aws 4.15.0-1079.83 LSN-0072-1, LSN-0070-1
Ubuntu Pro 18.04 LTS linux-oem 4.15.0-1093.103 LSN-0072-1, LSN-0070-1
Ubuntu Pro 16.04 LTS linux 4.4.0-186.216 LSN-0072-1, LSN-0070-1
Ubuntu Pro 16.04 LTS linux-aws 4.4.0-1111.123 LSN-0072-1, LSN-0070-1
Ubuntu Pro 16.04 LTS linux-azure 4.15.0-1092.102~16.04.1 LSN-0070-1
Ubuntu Pro 14.04 LTS linux +1 No fix yet —
Ubuntu Pro 14.04 LTS linux-aws 4.4.0-1075.79 USN-4427-1
Ubuntu Pro 14.04 LTS linux-lts-xenial 4.4.0-186.216~14.04.1 USN-4427-1, LSN-0072-1, LSN-0070-1

Advisories 7

References