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Vulnerability · Published Mar 18, 2026 · Assigned by Linux

CVE-2026-23269apparmor: validate DFA start states are in bounds in unpack_pdb

High 7.1

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.1%top 96.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: apparmor: validate DFA start states are in bounds in unpack_pdb Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unpack_pdb() will access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds the number of states in the DFA, this results in an out-of-bound read. ================================================================== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 ... Reject policies with out-of-bounds start states during unpacking to prevent the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.164-1DEBIAN-CVE-2026-23269
Debian:13linux6.12.74-2DEBIAN-CVE-2026-23269
Debian:14linux6.19.6-2DEBIAN-CVE-2026-23269
Ubuntu:22.04:LTSlinux5.15.0-173.183UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux6.8.0-106.106UBUNTU-CVE-2026-23269
Ubuntu:25.10linux6.17.0-19.19UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-aws5.15.0-1103.110UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-aws6.8.0-1050.53UBUNTU-CVE-2026-23269
Ubuntu:25.10linux-aws6.17.0-1009.9UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1009.9~24.04.2UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1050.53~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure5.15.0-1109.118UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure6.8.0-1051.57UBUNTU-CVE-2026-23269
Ubuntu:25.10linux-azure6.17.0-1010.10UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1010.10~24.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1109.118.1UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1058.65UBUNTU-CVE-2026-23269
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1058.65~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gcp5.15.0-1103.112UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-gcp6.8.0-1052.55UBUNTU-CVE-2026-23269
Ubuntu:25.10linux-gcp6.17.0-1009.9UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1009.9~24.04.3UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1052.55~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gke5.15.0-1099.105UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-gke6.8.0-1048.53UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1086.94UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1035.38UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-19.19~24.04.2UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-106.106~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-ibm5.15.0-1097.100UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-ibm6.8.0-1049.49UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1049.49~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1098.104UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-kvm5.15.0-1095.100UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-173.183UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-106.106.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-106.106.1~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1098.99UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1049.52UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1014.14UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1049.52~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1049.52.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1055.55UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1020.20UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1044.44UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1017.17UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oracle5.15.0-1100.106UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oracle6.8.0-1047.48UBUNTU-CVE-2026-23269
Ubuntu:25.10linux-oracle6.17.0-1009.9UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1009.9~24.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1047.48~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-raspi5.15.0-1097.100UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-raspi6.8.0-1050.54UBUNTU-CVE-2026-23269
Ubuntu:25.10linux-raspi6.17.0-1010.10UBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-23269
Ubuntu:25.10linux-realtime6.17.0-1008.9UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-23269
Ubuntu:25.10linux-riscv6.17.0-19.19.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-riscv-6.176.17.0-19.19.1~24.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-106.106~22.04.1UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-23269
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1028.29UBUNTU-CVE-2026-23269
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1067.71UBUNTU-CVE-2026-23269

Affected products (as reported)

VendorProductVersions
Linux Linux ad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before f43eea8ae0102ea198da211ef7f5ce83725ecf19ad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 5487871b2b56c19d26936ed6fdc62652b30941dfad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767aad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 07cf6320f40ea2ccfad63728cff34ecb309d03daad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0cad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 0baadb0eece2c4d939db10d3c323b4652ac79a58ad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 3bb7db43e32190c973d4019037cedb7895920184ad5ff3db53c68c2f12936bc74ea5dfe0af943592 – before 9063d7e2615f4a7ab321de6b520e23d370e58816
Linux Linux 3.4

References