CVE-2026-93254

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> arm64: entry: Avoid unnecessary local_irq_disable() on kernel exit<br /> <br /> Currently, when exiting to kernel mode, we attempt involuntary<br /> preemption. The preemption logic expects IRQs to be disabled, which is<br /> why we call local_irq_disable() before attempting preemption.<br /> <br /> However, depending on the context, local_irq_disable() may be<br /> unnecessary:<br /> <br /> - __el1_irq(), the non-NMI EL1 IRQ path, already has IRQs disabled, so<br /> local_irq_disable() is redundant.<br /> <br /> - irqentry_exit_to_kernel_mode_preempt() immediately returns when<br /> exiting from an NMI-like context, so calling local_irq_disable()<br /> beforehand is unnecessary work.<br /> <br /> Furthermore, it confuses the pNMI state tracking when we are in a<br /> context with interrupts disabled and the GIC_PRIO_PSR_I_SET bit is set<br /> in the PMR, leading to a warning when<br /> CONFIG_ARM64_DEBUG_PRIORITY_MASKING=y:<br /> <br /> WARNING: ./arch/arm64/include/asm/irqflags.h:63 at arm64_exit_to_kernel_mode+0xb8/0xc0, CPU#40: retsnoop/31805<br /> CPU: 40 UID: 0 PID: 31805 Comm: retsnoop Not tainted 7.2.0-rc6-next-20260805 #7 PREEMPTLAZY<br /> pstate: 234013c9 (nzCv DAIF +PAN -UAO +TCO +DIT +SSBS BTYPE=--)<br /> pc : arm64_exit_to_kernel_mode (arch/arm64/kernel/entry-common.c:63)<br /> lr : el1_abort (arch/arm64/kernel/entry-common.c:323)<br /> pmr: 000000f0<br /> Call trace:<br /> arm64_exit_to_kernel_mode (arch/arm64/kernel/entry-common.c:63) (P)<br /> el1_abort (arch/arm64/kernel/entry-common.c:323)<br /> el1h_64_sync_handler (arch/arm64/kernel/entry-common.c:449)<br /> el1h_64_sync (arch/arm64/kernel/entry.S:589)<br /> [...]<br /> <br /> Split arm64_exit_to_kernel_mode() into preempt, non-preempt, and<br /> dispatch parts so that we can avoid this extra work where it is not<br /> needed and avoid breaking the pNMI tracking logic.