{
  "cveId": "CVE-2026-64214",
  "url": "https://patchblox.com/security/cve/CVE-2026-64214",
  "summary": "CVE-2026-64214 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-64214, released July 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc/time: Remove redundant preempt_disable|e...",
  "description": "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 \u003CSF,ME,RI,LE\u003E  CR: 88222248  XER: 00000005   CFAR: c00000000003ffc4 DAR: c00000006be21300 DSISR: 40000000 IRQMASK: 0   NIP [c000000000029e40] arch_irq_work_raise\u002B0x10/0x70   LR [c00000000003ffc8] machine_check_queue_event\u002B0xa8/0x150   Call Trace:   [c0000000179d3c70] [c00000000003ff64] machine_check_queue_event\u002B0x44/0x150   [c0000000179d3d30] [c0000000000084e0] machine_check_early_common\u002B0x1f0/0x2c0  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 (\u0022powerpc/perf_event: Fix oops due to perf_event_do_pending call\u0022) to avoid races while raising irq work from exception context.  Later, commit 471ba0e686cb (\u0022irq_work: Do not raise an IPI when queueing work on the local CPU\u0022) added preemption protection in irq_work_queue() path, while commit 20b876918c06 (\u0022irq_work: Use per cpu atomics instead of regular atomics\u0022) added equivalent protection in irq_work_queue_on() before reaching arch_irq_work_raise():    irq_work_queue() / irq_work_queue_on()     -\u003E preempt_disable()       -\u003E __irq_work_queue_local()         -\u003E irq_work_raise()           -\u003E arch_irq_work_raise()  As a result, callers other than mce_irq_work_raise() already execute with preemption disabled, making the additional preempt_disable()/preempt_enable() pair in arch_irq_work_raise() redundant.  The arch_irq_work_raise() function executes in NMI context when called from MCE handler. Hence we will not be preempted or scheduled out since we are in NMI context with MSR[EE]=0. Therefore, it is safe to remove the preempt_disable()/preempt_enable() calls from here.  Remove it to avoid accessing preempt_count from real mode context.  [Maddy: Fixed the commit title]",
  "published": "2026-07-24T16:16:49Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00123,
  "epssPercentile": 0.02083,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}