CVE-2026-31650
HighSummary
W jądrze systemu Linux zidentyfikowano podatność w sterowniku vub300, która dotyczy błędu użycia po zwolnieniu pamięci (use-after-free) podczas odłączenia. Problem wynika z niewłaściwego zarządzania odniesieniami do kontrolera, co może prowadzić do nieprawidłowego zwolnienia pamięci.
Risk Assessment
Organizacje mogą być narażone na problemy z pamięcią, takie jak wycieki pamięci lub awarie systemu, jeśli sterownik zostanie odłączony bez fizycznego odłączenia urządzenia. Może to prowadzić do niestabilności systemu i potencjalnych luk w zabezpieczeniach.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, która zawiera poprawki dla tej podatności, aby zapewnić prawidłowe zarządzanie pamięcią i uniknąć problemów związanych z użyciem po zwolnieniu.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: fix use-after-free on disconnect The vub300 driver maintains an explicit reference count for the controller and its driver data and the last reference can in theory be dropped after the driver has been unbound. This specifically means that the controller allocation must not be device managed as that can lead to use-after-free. Note that the lifetime is currently also incorrectly tied the parent USB device rather than interface, which can lead to memory leaks if the driver is unbound without its device being physically disconnected (e.g. on probe deferral). Fix both issues by reverting to non-managed allocation of the controller.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

