CVE-2026-90342
UnknownSummary
In the Linux kernel's BPF arena, there is a potential deadlock on mmap_lock when arena_vm_fault() fails to take the arena spinlock. The function returns VM_FAULT_RETRY without having dropped mmap_lock, causing it to be taken twice on retry and leading to a deadlock.
Risk Assessment
A deadlock can hang the entire system or process, causing unresponsiveness and requiring a reboot.
Recommendation
Apply a kernel patch that changes the return value to VM_FAULT_SIGBUS instead of VM_FAULT_RETRY to avoid the deadlock.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix mmap_lock deadlock on arena lock failure Reported by the Sashiko AI review. arena_vm_fault() returns VM_FAULT_RETRY when it can't take arena->spinlock, but it never took mmap_lock. The fault path assumes a VM_FAULT_RETRY handler already dropped mmap_lock and re-takes it on the retry, so mmap_lock gets taken twice and can deadlock: do_user_addr_fault() { fault = handle_mm_fault(...); // calls arena_vm_fault() if (fault & VM_FAULT_RETRY) goto retry; // re-locks mmap_lock mmap_read_unlock(mm); } Return VM_FAULT_SIGBUS instead, for two reasons: 1. We could keep VM_FAULT_RETRY, but then we'd have to drop the fault lock first and cap the retry ourselves, the way __folio_lock_or_retry() does. 2. A failed raw_res_spin_lock_irqsave() already means a possible deadlock was detected, so retrying just hits the same lock again. So returning VM_FAULT_RETRY here is overkill.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS