CyberRota Analysis
AI-GeneratedThe vulnerability affects the semaphore management in the kernel, specifically through the GETALL and SETALL commands, which can be exploited by an unprivileged local user. By rapidly destroying and recreating semaphore sets, an attacker can manipulate the sequence number, leading to out-of-bounds memory access that may result in privilege escalation. Organizations utilizing affected kernel versions should prioritize this issue to mitigate potential security risks.
Original NVD Description
The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, allocated a buffer sized for that count, and reacquired the lock. A sequence-number check was used to verify that the set had not been replaced in the interim, but the sequence number wraps after 0x8000 create/destroy cycles. By rapidly destroying and recreating semaphore sets at the same index, another process can cause the sequence number to wrap, allowing a set with a different number of semaphores to pass validation. The subsequent copy then reads or writes past the end of the allocated buffer. An unprivileged local user can trigger out-of-bounds reads and writes on kernel heap memory, potentially leading to privilege escalation.
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