CVE-2026-53262
HighExploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
W jądrze Linux wykryto podatność Use-After-Free (UAF) w sterowniku L2TP dla protokołu PPPoL2TP. Funkcja pppol2tp_ioctl() odczytywała wskaźnik do sesji bez odpowiedniego blokowania i zliczania referencji, co umożliwiało wyścig podczas operacji kopiowania z przestrzeni użytkownika. Poprawka polega na bezpiecznym pobraniu referencji do sesji za pomocą funkcji RCU-safe z inkrementacją licznika referencji.
Risk Assessment
Atakujący może doprowadzić do zdalnego wykonania kodu lub wycieku informacji poprzez wywołanie wyścigu między operacją ioctl a zamknięciem gniazda. Podatność umożliwia naruszenie integralności i poufności systemu.
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