CVE-2026-64214

취약점 유형

In the Linux kernel, the following vulnerability has been resolved: powerpc/time: Remove redundant preempt_disable|enable() calls from arch_irq_work_raise() A kernel panic is observed when handling machine check exceptions from real mode. BUG: Unable to handle kernel data access on read at 0xc00000006be21300 Oops: Kernel access of bad area, sig: 11 [#1] MSR: 8000000000001003 <SF,ME,RI,LE> CR: 88222248 XER: 00000005 CFAR: c00000000003ffc4 DAR: c00000006be21300 DSISR: 40000000 IRQMASK: 0 NIP [c000000000029e40] arch_irq_work_raise+0x10/0x70 LR [c00000000003ffc8] machine_check_queue_event+0xa8/0x150 Call Trace: [c0000000179d3c70] [c00000000003ff64] machine_check_queue_event+0x44/0x150 [c0000000179d3d30] [c0000000000084e0] machine_check_early_common+0x1f0/0x2c0 The crash occurs because arch_irq_work_raise() calls preempt_disable() from machine check exception (MCE) handlers running in real mode. In this context, accessing the preempt_count can fault, leading to the panic. The preempt_disable()/preempt_enable() pair in arch_irq_work_raise() was originally added by commit 0fe1ac48bef0 ("powerpc/perf_event: Fix oops due to perf_event_do_pending call") to avoid races while raising irq work

영향받는 제품

• linux linux_kernel

참고 자료

• https://git.kernel.org/stable/c/31467b23823ffec1f6fff407f8e3ca9af8b7491a
• https://git.kernel.org/stable/c/51860e423592893cd7bfa7287d99a3aff4dc3a9d
• https://git.kernel.org/stable/c/6dcd072a5ae3aed336e4a67a7d4cc5205b240065
• https://git.kernel.org/stable/c/72d8d1c36452a4d3ee134b1da48de7518c1329f9
• https://git.kernel.org/stable/c/8079acc5ee5235a627e4586d4f42082a9000ea64
• https://git.kernel.org/stable/c/a09d07ac45e283c9861a9ceea06f56d0ba851d22