Vulnerabilidad en Linux (CVE-2026-46254)

En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:<br /> <br /> AppArmor: Permitir que apparmor maneje tablas dfa no alineadas<br /> <br /> Las tablas dfa pueden originarse desde el kernel o el espacio de usuario y la alineación de 8 bytes no siempre está garantizada y como tal puede desencadenar accesos a memoria no alineados en varias arquitecturas. Resultando en lo siguiente<br /> <br /> [ 73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720<br /> [ 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<br /> 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<br /> [ 74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE<br /> [ 74.536543] Call Trace:<br /> [ 74.568561] [] dump_stack+0x8/0x18<br /> [ 74.633757] [] __warn+0xd8/0x100<br /> [ 74.696664] [] warn_slowpath_fmt+0x34/0x74<br /> [ 74.771006] [] aa_dfa_unpack+0x6cc/0x720<br /> [ 74.843062] [] unpack_pdb+0xbc/0x7e0<br /> [ 74.910545] [] unpack_profile+0xbe0/0x1300<br /> [ 74.984888] [] aa_unpack+0xe0/0x6a0<br /> [ 75.051226] [] aa_replace_profiles+0x64/0x1160<br /> [ 75.130144] [] policy_update+0xf0/0x280<br /> [ 75.201057] [] profile_replace+0xa8/0x100<br /> [ 75.274258] [] vfs_write+0x90/0x420<br /> [ 75.340594] [] ksys_write+0x4c/0xe0<br /> [ 75.406932] [] sys_write+0x14/0x40<br /> [ 75.472126] [] linux_sparc_syscall+0x34/0x44<br /> [ 75.548802] ---[ end trace 0000000000000000 ]---<br /> [ 75.609503] dfa blob stream 0xfff0000008926b96 not aligned.<br /> [ 75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720<br /> <br /> Solucionarlo utilizando las funciones auxiliares get_unaligned_xx().