{"id":"CVE-2026-46254","title":"AppArmor: Allow apparmor to handle unaligned dfa tables","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nAppArmor: Allow apparmor to handle unaligned dfa tables\n\nThe dfa tables can originate from kernel or userspace and 8-byte alignment\nisn't always guaranteed and as such …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < bd00629b527888a08a5222640fea045c6f64f5b5","Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e","Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < 23f112bd6144e815153462e12d313ac3e7027168","Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < cded636008bde2b397a7cf63b8299d7c303aaf6a","Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < 64802f731214a51dfe3c6c27636b3ddafd003eb0","Linux 4.11"],"published":"2026-06-03","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:41:30.894Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46254","references":[{"url":"https://git.kernel.org/stable/c/bd00629b527888a08a5222640fea045c6f64f5b5"},{"url":"https://git.kernel.org/stable/c/ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e"},{"url":"https://git.kernel.org/stable/c/23f112bd6144e815153462e12d313ac3e7027168"},{"url":"https://git.kernel.org/stable/c/cded636008bde2b397a7cf63b8299d7c303aaf6a"},{"url":"https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0"}],"tags":["cve.org"],"epss":0.00114,"epssPercentile":0.01396,"ingestedAt":"2026-10-21T12:48:53.628Z","slug":"CVE-2026-46254","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nAppArmor: Allow apparmor to handle unaligned dfa tables\n\nThe dfa tables can originate from kernel or userspace and 8-byte alignment\nisn't always guaranteed and as such may trigger unaligned memory accesses\non various architectures. Resulting in the following\n\n[   73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720\n[   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\nsd_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\n[   74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE\n[   74.536543] Call Trace:\n[   74.568561] [<0000000000434c24>] dump_stack+0x8/0x18\n[   74.633757] [<0000000000476438>] __warn+0xd8/0x100\n[   74.696664] [<00000000004296d4>] warn_slowpath_fmt+0x34/0x74\n[   74.771006] [<00000000008db28c>] aa_dfa_unpack+0x6cc/0x720\n[   74.843062] [<00000000008e643c>] unpack_pdb+0xbc/0x7e0\n[   74.910545] [<00000000008e7740>] unpack_profile+0xbe0/0x1300\n[   74.984888] [<00000000008e82e0>] aa_unpack+0xe0/0x6a0\n[   75.051226] [<00000000008e3ec4>] aa_replace_profiles+0x64/0x1160\n[   75.130144] [<00000000008d4d90>] policy_update+0xf0/0x280\n[   75.201057] [<00000000008d4fc8>] profile_replace+0xa8/0x100\n[   75.274258] [<0000000000766bd0>] vfs_write+0x90/0x420\n[   75.340594] [<00000000007670cc>] ksys_write+0x4c/0xe0\n[   75.406932] [<0000000000767174>] sys_write+0x14/0x40\n[   75.472126] [<0000000000406174>] linux_sparc_syscall+0x34/0x44\n[   75.548802] ---[ end trace 0000000000000000 ]---\n[   75.609503] dfa blob stream 0xfff0000008926b96 not aligned.\n[   75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720\n\nWork around it by using the get_unaligned_xx() helpers.\n\n## Affected\n\n- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < bd00629b527888a08a5222640fea045c6f64f5b5`\n- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e`\n- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < 23f112bd6144e815153462e12d313ac3e7027168`\n- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < cded636008bde2b397a7cf63b8299d7c303aaf6a`\n- `Linux >= e6e8bf418850d7958311a96ccfb594f2bcc8313e < 64802f731214a51dfe3c6c27636b3ddafd003eb0`\n- `Linux 4.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}