CVE-2026-93254
UnknownSummary
In the Linux kernel for ARM64, an issue was found in the kernel exit path where local_irq_disable() was unnecessarily called in contexts where interrupts were already disabled or in NMI contexts. This confused the pNMI state tracking and caused warnings when CONFIG_ARM64_DEBUG_PRIORITY_MASKING is enabled. The fix splits arm64_exit_to_kernel_mode() into parts to avoid extra work and preserve correct logic.
Risk Assessment
Organizations may experience false warnings and potential system stability issues on ARM64 platforms with interrupt priority debugging enabled. In extreme cases, this could lead to incorrect preemption and interrupt state tracking behavior.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix for CVE-2026-93254. Monitor official kernel releases and apply the patch in production ARM64 systems.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: arm64: entry: Avoid unnecessary local_irq_disable() on kernel exit Currently, when exiting to kernel mode, we attempt involuntary preemption. The preemption logic expects IRQs to be disabled, which is why we call local_irq_disable() before attempting preemption. However, depending on the context, local_irq_disable() may be unnecessary: - __el1_irq(), the non-NMI EL1 IRQ path, already has IRQs disabled, so local_irq_disable() is redundant. - irqentry_exit_to_kernel_mode_preempt() immediately returns when exiting from an NMI-like context, so calling local_irq_disable() beforehand is unnecessary work. Furthermore, it confuses the pNMI state tracking when we are in a context with interrupts disabled and the GIC_PRIO_PSR_I_SET bit is set in the PMR, leading to a warning when CONFIG_ARM64_DEBUG_PRIORITY_MASKING=y: WARNING: ./arch/arm64/include/asm/irqflags.h:63 at arm64_exit_to_kernel_mode+0xb8/0xc0, CPU#40: retsnoop/31805 CPU: 40 UID: 0 PID: 31805 Comm: retsnoop Not tainted 7.2.0-rc6-next-20260805 #7 PREEMPTLAZY pstate: 234013c9 (nzCv DAIF +PAN -UAO +TCO +DIT +SSBS BTYPE=--) pc : arm64_exit_to_kernel_mode (arch/arm64/kernel/entry-common.c:63) lr : el1_abort (arch/arm64/kernel/entry-common.c:323) pmr: 000000f0 Call trace: arm64_exit_to_kernel_mode (arch/arm64/kernel/entry-common.c:63) (P) el1_abort (arch/arm64/kernel/entry-common.c:323) el1h_64_sync_handler (arch/arm64/kernel/entry-common.c:449) el1h_64_sync (arch/arm64/kernel/entry.S:589) [...] Split arm64_exit_to_kernel_mode() into preempt, non-preempt, and dispatch parts so that we can avoid this extra work where it is not needed and avoid breaking the pNMI tracking logic.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS