CVE-2026-53193
HighExploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
W jądrze Linuxa w podsystemie ALSA timer wykryto podatność na użycie po zwolnieniu (use-after-free). Podczas zwalniania obiektu timera (snd_timer_free) nie są prawidłowo odłączane instancje timerów podrzędnych (slave), które nadal wskazują na zwolniony obiekt, co może prowadzić do naruszenia bezpieczeństwa pamięci. Problem jest łatwy do wywołania przy użyciu nowego mechanizmu timerów przestrzeni użytkownika (CONFIG_SND_UTIMER).
Risk Assessment
Atakujący może wykorzystać tę podatność do eskalacji uprawnień lub wywołania odmowy usługi (DoS) poprzez celowe otwieranie i zamykanie plików timerów, podczas gdy inne aplikacje nadal mają do nich dostęp.
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