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OpenAdvisories
Medium · 5.5 CVE-2026-47332 EUVD-2026-32987GHSA-4hmr-4vjc-3rg2

Out-of-bounds read in Ubuntu Linux AppArmor notification handling

Published May 28, 2026 · Updated May 28, 2026 · Assigned by canonical

Vendor: Canonical Product: Ubuntu Linux 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-5.19 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-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 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-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.19 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-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-lowlatency 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-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-lowlatency Package: linux-nvidia-tegra Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 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-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 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-raspi Package: linux-raspi-realtime Package: linux-raspi2 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-5.19 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-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Platform: Linux Ecosystem: Ubuntu

Description

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an internal structure, leading to an out-of-bounds read in notification handling code. The bug can be triggered by an unprivileged local user and can result in information disclosure from adjacent slab objects.

Affected products

VendorProductAffectedFixed
Canonical Ubuntu Linux 6.8.0 – < 6.8.0-124.124, 6.17.0 – < 6.17.0-35.35, 7.0.0 – < 7.0.0-22.22 6.8.0-124.124

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 6.8.0-1023.27 —
Ubuntu 26.04 LTS linux 7.0.0-22.22 USN-8370-1
Ubuntu 26.04 LTS linux-aws +1 7.0.0-1006.6 USN-8370-1
Ubuntu 26.04 LTS linux-gcp +1 7.0.0-1005.5 USN-8370-1
Ubuntu 26.04 LTS linux-ibm +1 7.0.0-1007.7 USN-8461-1, USN-8370-1
Ubuntu 26.04 LTS linux-nvidia 7.0.0-1009.9 USN-8370-1
Ubuntu 26.04 LTS linux-oem-7.0 7.0.0-1008.8 USN-8489-1
Ubuntu 26.04 LTS linux-raspi 7.0.0-1011.11 USN-8370-1
Ubuntu 26.04 LTS linux-riscv +1 7.0.0-22.22.1 USN-8370-1
Ubuntu 25.10 linux 6.17.0-35.35 USN-8371-1
Ubuntu 25.10 linux-aws +1 6.17.0-1017.17 USN-8371-1
Ubuntu 25.10 linux-azure-fde No fix yet —
Ubuntu 25.10 linux-gcp 6.17.0-1018.19 USN-8374-1
Ubuntu 25.10 linux-oracle 6.17.0-1016.16 USN-8371-1
Ubuntu 25.10 linux-raspi 6.17.0-1018.18 USN-8371-1
Ubuntu 25.10 linux-realtime 6.17.0-1014.16 USN-8371-1
Ubuntu 25.10 linux-riscv 6.17.0-35.35.1 —
Ubuntu 24.04 LTS linux 6.8.0-124.124 USN-8373-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1057.60 USN-8373-1
Ubuntu 24.04 LTS linux-aws-6.17 +1 6.17.0-1017.17~24.04.1 USN-8374-1, USN-8371-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1058.64 USN-8373-1
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1058.65 —
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1039.42 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1060.63 USN-8373-1
Ubuntu 24.04 LTS linux-gcp-6.17 6.17.0-1018.19~24.04.1 USN-8374-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1055.61 USN-8373-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1042.45 USN-8373-1
Ubuntu 24.04 LTS linux-hwe-6.17 6.17.0-35.35~24.04.1 USN-8371-1
Ubuntu 24.04 LTS linux-hwe-7.0 7.0.0-28.28~24.04.1 USN-8569-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1057.58 USN-8373-1
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-134.134.1 USN-8497-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1055.58 USN-8373-1
Ubuntu 24.04 LTS linux-nvidia-6.17 6.17.0-1021.21 USN-8371-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1055.58.1 USN-8373-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1026.26 USN-8373-1
Ubuntu 24.04 LTS linux-oem-6.17 6.17.0-1024.24 USN-8371-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1054.55 USN-8373-1
Ubuntu 24.04 LTS linux-oracle-6.17 6.17.0-1016.16~24.04.1 USN-8371-1
Ubuntu 24.04 LTS linux-raspi 6.8.0-1057.61 USN-8373-1
Ubuntu 24.04 LTS linux-riscv +15 No fix yet —
Ubuntu 24.04 LTS linux-riscv-6.17 6.17.0-35.35.1~24.04.1 —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1032.33 USN-8499-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1057.60~22.04.1 USN-8373-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1059.65~22.04.1 USN-8440-1
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1058.65~22.04.1 —
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1060.63~22.04.1 USN-8373-1
Ubuntu 22.04 LTS linux-hwe-6.8 +1 6.8.0-124.124~22.04.1 USN-8373-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1057.58~22.04.1 USN-8373-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-134.134.1~22.04.1 USN-8497-1
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1055.58~22.04.1 USN-8373-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1054.55~22.04.1 USN-8373-1
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Show 6 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2046.47 USN-8373-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1052.53 USN-8373-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.17 6.17.0-1014.16~24.04.1 USN-8371-1
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1052.53~22.04.1 USN-8373-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1057.60+fips1 USN-8373-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1059.65+fips1 USN-8393-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-124.124+fips1 USN-8373-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1060.63+fips1 USN-8373-1

Advisories 11

References