In the Linux kernel, the following vulnerability has been resolved:
AppArmor: Allow apparmor to handle unaligned dfa tables
The dfa tables can originate from kernel or userspace and 8-byte alignment isn't always guaranteed and as such may trigger unaligned memory accesses on various architectures. Resulting in the following
[ 73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720 [ 74.015867] Modules linked in: binfmt_misc evdev flash sg drm drm_panel_orientation_quirks backlight i2c_core configfs nfnetlink autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid sr_mod hid cdrom sd_mod ata_generic ohci_pci ehci_pci ehci_hcd ohci_hcd pata_ali libata sym53c8xx scsi_transport_spi tg3 scsi_mod usbcore libphy scsi_common mdio_bus usb_common [ 74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE [ 74.536543] Call Trace: [ 74.568561] [<0000000000434c24>] dump_stack+0x8/0x18 [ 74.633757] [<0000000000476438>] __warn+0xd8/0x100 [ 74.696664] [<00000000004296d4>] warn_slowpath_fmt+0x34/0x74 [ 74.771006] [<00000000008db28c>] aa_dfa_unpack+0x6cc/0x720 [ 74.843062] [<00000000008e643c>] unpack_pdb+0xbc/0x7e0 [ 74.910545] [<00000000008e7740>] unpack_profile+0xbe0/0x1300 [ 74.984888] [<00000000008e82e0>] aa_unpack+0xe0/0x6a0 [ 75.051226] [<00000000008e3ec4>] aa_replace_profiles+0x64/0x1160 [ 75.130144] [<00000000008d4d90>] policy_update+0xf0/0x280 [ 75.201057] [<00000000008d4fc8>] profile_replace+0xa8/0x100 [ 75.274258] [<0000000000766bd0>] vfs_write+0x90/0x420 [ 75.340594] [<00000000007670cc>] ksys_write+0x4c/0xe0 [ 75.406932] [<0000000000767174>] sys_write+0x14/0x40 [ 75.472126] [<0000000000406174>] linux_sparc_syscall+0x34/0x44 [ 75.548802] ---[ end trace 0000000000000000 ]--- [ 75.609503] dfa blob stream 0xfff0000008926b96 not aligned. [ 75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720
Work around it by using the get_unaligned_xx() helpers.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-6.8.0-1058-gke-64kUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-xilinx-6.8Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-gcp-6.8Upgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1057-oracleUpgrade linux-image-nvidia-tegraUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1060-aws-64kUpgrade linux-image-6.8.0-1060-raspiUpgrade linux-image-gkeopUpgrade linux-image-gkeUpgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-134-genericUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1057-oracle-64kUpgrade linux-image-6.8.0-1060-ibmUpgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1058-nvidia-64kUpgrade linux-image-6.8.0-134-fipsUpgrade linux-image-6.8.0-1029-nvidia-tegraUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-realtime-6.8.1Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-fipsUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-6.8.0-134-lowlatency-64kUpgrade linux-image-gke-64kUpgrade linux-image-azure-fde-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-realtimeUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1063-gcpUpgrade linux-image-azureUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1058-nvidia-lowlatencyUpgrade linux-image-nvidia-6.8Upgrade linux-image-oem-22.04dUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-134-generic-64kUpgrade linux-image-genericUpgrade linux-image-virtual-6.8Upgrade linux-image-raspi-6.8Upgrade linux-image-oem-20.04bUpgrade linux-image-lowlatency-6.8Upgrade linux-image-generic-64kUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-oem-20.04Upgrade linux-image-oem-22.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-fips-6.8Upgrade linux-image-6.8.0-136-genericUpgrade linux-image-oem-22.04bUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.0-1058-nvidia-lowlatency-64kUpgrade linux-image-azure-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-oem-20.04cUpgrade linux-image-kvmUpgrade linux-image-nvidia-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-134-lowlatencyUpgrade linux-image-6.8.0-1060-awsUpgrade linux-image-6.8.0-1029-nvidia-tegra-rtUpgrade linux-image-6.8.1-1055-realtimeUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-1045-gkeopUpgrade linux-image-xilinxUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1063-azureUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gke-64k-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-awsUpgrade linux-image-oem-22.04aUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-ibmUpgrade linux-image-aws-64kUpgrade linux-image-6.8.0-1063-gcp-fipsUpgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-2049-raspi-realtimeUpgrade linux-image-6.8.0-1062-azure-fipsUpgrade linux-image-6.8.0-1058-nvidiaUpgrade linux-image-ibm-6.8Upgrade linux-image-gke-6.8Upgrade linux-image-oem-20.04dUpgrade linux-image-oracleUpgrade linux-image-laptop-23.10Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-1063-gcp-64kUpgrade linux-image-6.8.0-1058-gkeUpgrade linux-image-oracle-6.8Upgrade linux-image-lowlatencyUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-gkeop-6.8Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-raspi-realtimeUpgrade linux-image-generic-6.8Upgrade linux-image-6.8.0-1060-aws-fipsUpgrade linux-image-oem-22.04cUpgrade linux-image-gcpUpgrade linux-image-azure-fdeUpgrade linux-image-aws-fips-6.8Upgrade linux-image-oracle-64k-6.8 | Jul 2, 2026 | Jul 1, 2026 |
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