CVE-2025-38696

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> MIPS: Don&amp;#39;t crash in stack_top() for tasks without ABI or vDSO<br /> <br /> Not all tasks have an ABI associated or vDSO mapped,<br /> for example kthreads never do.<br /> If such a task ever ends up calling stack_top(), it will derefence the<br /> NULL ABI pointer and crash.<br /> <br /> This can for example happen when using kunit:<br /> <br /> mips_stack_top+0x28/0xc0<br /> arch_pick_mmap_layout+0x190/0x220<br /> kunit_vm_mmap_init+0xf8/0x138<br /> __kunit_add_resource+0x40/0xa8<br /> kunit_vm_mmap+0x88/0xd8<br /> usercopy_test_init+0xb8/0x240<br /> kunit_try_run_case+0x5c/0x1a8<br /> kunit_generic_run_threadfn_adapter+0x28/0x50<br /> kthread+0x118/0x240<br /> ret_from_kernel_thread+0x14/0x1c<br /> <br /> Only dereference the ABI point if it is set.<br /> <br /> The GIC page is also included as it is specific to the vDSO.<br /> Also move the randomization adjustment into the same conditional.