CVE-2026-53264
HighExploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
W jądrze Linux wykryto błąd wyścigu (race condition) między operacjami NEWTFILTER i DELFILTER w podsystemie net/sched/act_api. Przy współbieżnym działaniu mogło dojść do użycia po zwolnieniu (UAF) struktury tc_action, ponieważ zwalnianie pamięci następowało natychmiast, bez opóźnienia wymaganego przez mechanizm RCU. Łatka przywraca opóźnione zwalnianie przez call_rcu(), co eliminuje podatność.
Risk Assessment
Podatność umożliwia lokalnemu atakującemu (wymagającemu uprawnień do zarządzania regułami sieciowymi) wywołanie naruszenia pamięci jądra, co może prowadzić do awarii systemu (DoS) lub potencjalnie do eskalacji uprawnień.
Recommendation
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