CVE-2025-21718

In the Linux kernel, the following vulnerability has been resolved:

net: rose: fix timer races against user threads

Rose timers only acquire the socket spinlock, without

checking if the socket is owned by one user thread.

Add a check and rearm the timers if needed.

BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174

Read of size 2 at addr ffff88802f09b82a by task swapper/0/0

CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc5-syzkaller-00172-gd1bf27c4e176 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024

Call Trace:

<IRQ>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120

print_address_description mm/kasan/report.c:378 [inline]

print_report+0x169/0x550 mm/kasan/report.c:489

kasan_report+0x143/0x180 mm/kasan/report.c:602

rose_timer_expiry+0x31d/0x360 net/rose/rose_timer.c:174

call_timer_fn+0x187/0x650 kernel/time/timer.c:1793

expire_timers kernel/time/timer.c:1844 [inline]

__run_timers kernel/time/timer.c:2418 [inline]

__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430

run_timer_base kernel/time/timer.c:2439 [inline]

run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449

handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561

__do_softirq kernel/softirq.c:595 [inline]

invoke_softirq kernel/softirq.c:435 [inline]

__irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662

irq_exit_rcu+0x9/0x30 kernel/softirq.c:678

instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]

sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049

</IRQ>