CVE-2025-68322

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> parisc: Avoid crash due to unaligned access in unwinder<br /> <br /> Guenter Roeck reported this kernel crash on his emulated B160L machine:<br /> <br /> Starting network: udhcpc: started, v1.36.1<br /> Backtrace:<br /> [] unwind_once+0x1c/0x5c<br /> [] walk_stackframe.isra.0+0x74/0xb8<br /> [] arch_stack_walk+0x28/0x38<br /> [] stack_trace_save+0x48/0x5c<br /> [] set_track_prepare+0x44/0x6c<br /> [] ___slab_alloc+0xfc4/0x1024<br /> [] __slab_alloc.isra.0+0x58/0x90<br /> [] kmem_cache_alloc_noprof+0x2ac/0x4a0<br /> [] __anon_vma_prepare+0x60/0x280<br /> [] __vmf_anon_prepare+0x68/0x94<br /> [] do_wp_page+0x8cc/0xf10<br /> [] handle_mm_fault+0x6c0/0xf08<br /> [] do_page_fault+0x110/0x440<br /> [] handle_interruption+0x184/0x748<br /> [] schedule+0x4c/0x190<br /> BUG: spinlock recursion on CPU#0, ifconfig/2420<br /> lock: terminate_lock.2+0x0/0x1c, .magic: dead4ead, .owner: ifconfig/2420, .owner_cpu: 0<br /> <br /> While creating the stack trace, the unwinder uses the stack pointer to guess<br /> the previous frame to read the previous stack pointer from memory. The crash<br /> happens, because the unwinder tries to read from unaligned memory and as such<br /> triggers the unalignment trap handler which then leads to the spinlock<br /> recursion and finally to a deadlock.<br /> <br /> Fix it by checking the alignment before accessing the memory.