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CVE-2023-52707 is a use-after-free vulnerability in the Linux kernel scheduler Pressure Stall Information (PSI) subsystem. When a non-root cgroup is removed while a thread has registered a PSI trigger and is polling a pressure file in that cgroup, cgroup teardown invokes psi_trigger_destroy() and frees the polling wait queue. The polling thread can nevertheless retain a reference to the pressure file. On subsequent file close or thread exit, ep_remove_wait_queue() reaches remove_wait_queue() and accesses the freed wait queue. The upstream correction handles the wait-queue lifetime mismatch with wake_up_pollfree().
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Use-after-free in the Linux kernel scheduler pressure-stall information subsystem.
Use-after-free vulnerability in the Linux kernel scheduler pressure-stall information subsystem.
A resolved use-after-free vulnerability in the Linux kernel's scheduler Pressure Stall Information (sched/psi) code, specifically ep_remove_wait_queue(). The referenced assessment was manually raised from Low to Moderate because of the potential use-after-free condition and high attack complexity.
A Linux kernel use-after-free flaw in the sched/psi pressure-stall information subsystem. A local low-privileged user can trigger a stale polling-waitqueue reference by removing a non-root cgroup while a thread polls a pressure file, potentially affecting confidentiality, integrity, and availability.
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