CVE-2025-21718

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: rose: fix timer races against user threads<br /> <br /> Rose timers only acquire the socket spinlock, without<br /> checking if the socket is owned by one user thread.<br /> <br /> Add a check and rearm the timers if needed.<br /> <br /> BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174<br /> Read of size 2 at addr ffff88802f09b82a by task swapper/0/0<br /> <br /> CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc5-syzkaller-00172-gd1bf27c4e176 #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:94 [inline]<br /> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120<br /> print_address_description mm/kasan/report.c:378 [inline]<br /> print_report+0x169/0x550 mm/kasan/report.c:489<br /> kasan_report+0x143/0x180 mm/kasan/report.c:602<br /> rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174<br /> call_timer_fn+0x187/0x650 kernel/time/timer.c:1793<br /> expire_timers kernel/time/timer.c:1844 [inline]<br /> __run_timers kernel/time/timer.c:2418 [inline]<br /> __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430<br /> run_timer_base kernel/time/timer.c:2439 [inline]<br /> run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449<br /> handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561<br /> __do_softirq kernel/softirq.c:595 [inline]<br /> invoke_softirq kernel/softirq.c:435 [inline]<br /> __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662<br /> irq_exit_rcu+0x9/0x30 kernel/softirq.c:678<br /> instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]<br /> sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049<br />