CVSS 7.8 · High KEV · sudah dieksploitasi EPSS 1,3%
Kerentanan Time-of-check Time-of-use (TOCTOU) Race Condition pada linux kernel, debian linux. Skor CVSS 3.1 7.8 (High) menurut CNA. Masuk katalog KEV CISA pada 4 September 2025, artinya sudah terbukti dieksploitasi.
In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand(). If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail. Add the tsk->exit_state check into run_posix_cpu_timers() to fix this. This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 2.6.36 hingga sebelum 5.4.295 |
| linux | linux kernel | Versi 5.5 hingga sebelum 5.10.239 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.186 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.142 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.94 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.12.34 |
| linux | linux kernel | Versi 6.13 hingga sebelum 6.15.3 |
| linux | linux kernel | Versi 6.16 rc1 |
| debian | debian linux | Versi 11.0 |