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CVE-2025-21718 – Here is the title: “Rose Linux Kernel Timer Use-After-Free Vulnerability”

The following table lists the changes that have been made to the
CVE-2025-21718 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 27, 2025

    Action Type Old Value New Value
    Added Description 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:

    __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

    Added Reference https://git.kernel.org/stable/c/1992fb261c90e9827cf5dc3115d89bb0853252c9
    Added Reference https://git.kernel.org/stable/c/51c128ba038cf1b79d605cbee325919b45ab95a5
    Added Reference https://git.kernel.org/stable/c/58051a284ac18a3bb815aac6289a679903ddcc3f
    Added Reference https://git.kernel.org/stable/c/5de7665e0a0746b5ad7943554b34db8f8614a196
    Added Reference https://git.kernel.org/stable/c/f55c88e3ca5939a6a8a329024aed8f3d98eea8e4
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