CVE-2026-23268
HighSummary
W jądrze Linuxa zidentyfikowano podatność, która pozwala nieuprzywilejowanemu lokalnemu użytkownikowi na zarządzanie politykami AppArmor. Użytkownik może załadować, zastąpić lub usunąć profile, wykorzystując atak 'confused deputy', co prowadzi do pełnego zarządzania polityką.
Risk Assessment
Organizacja może być narażona na poważne zagrożenia, takie jak usunięcie ograniczeń bezpieczeństwa, ataki DoS na system lub aplikacje oraz eskalacja uprawnień lokalnych. Potencjalne konsekwencje mogą prowadzić do poważnych naruszeń bezpieczeństwa.
Recommendation
Zaleca się, aby upewnić się, że zadanie zapisujące do interfejsu ma uprawnienia będące podzbiorem zadania, które otworzyło interfejs. Należy również monitorować i ograniczać dostęp do otwartych deskryptorów plików przez nieuprzywilejowane procesy.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened fd to a privileged process, and getting the privileged process to write to the interface. This does require a privileged target that can be manipulated to do the write for the unprivileged process, but once such access is achieved full policy management is possible and all the possible implications that implies: removing confinement, DoS of system or target applications by denying all execution, by-passing the unprivileged user namespace restriction, to exploiting kernel bugs for a local privilege escalation. The policy management interface can not have its permissions simply changed from 0666 to 0600 because non-root processes need to be able to load policy to different policy namespaces. Instead ensure the task writing the interface has privileges that are a subset of the task that opened the interface. This is already done via policy for confined processes, but unconfined can delegate access to the opened fd, by-passing the usual policy check.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS