CVE-2006-5749

La función isdn_ppp_ccp_reset_alloc_state en el drivers/isdn/isdn_ppp.c del kernel del Linu 2.4 anterior al 2.4.34-rc4 no llama a la función init_timer para restaurar el estado del temporizador ISDN PPP CCP, lo cual genera vectores de ataque desconocidos y, como resultado, la caída del sistema.

The isdn_ppp_ccp_reset_alloc_state function in drivers/isdn/isdn_ppp.c in the Linux 2.4 kernel before 2.4.34-rc4, as well as the 2.6 kernel, does not call the init_timer function for the ISDN PPP CCP reset state timer, which has unknown attack vectors and results in a system crash. The listxattr syscall can corrupt user space under certain circumstances. The problem seems to be related to signed/unsigned conversion during size promotion. The ext3fs_dirhash function in Linux kernel 2.6.x allows local users to cause a denial of service (crash) via an ext3 stream with malformed data structures. The mincore function in the Linux kernel before 2.4.33.6, as well as the 2.6 kernel, does not properly lock access to user space, which has unspecified impact and attack vectors, possibly related to a deadlock.