CVE-2026-64214 (GCVE-0-2026-64214)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-07-24 15:23
VLAI
Title
powerpc/time: Remove redundant preempt_disable|enable() calls from arch_irq_work_raise()
Summary
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 from exception context. Later, commit 471ba0e686cb ("irq_work: Do not raise an IPI when queueing work on the local CPU") added preemption protection in irq_work_queue() path, while commit 20b876918c06 ("irq_work: Use per cpu atomics instead of regular atomics") added equivalent protection in irq_work_queue_on() before reaching arch_irq_work_raise(): irq_work_queue() / irq_work_queue_on() -> preempt_disable() -> __irq_work_queue_local() -> irq_work_raise() -> 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]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cc15ff3275694fedc33cd3d53212a43eec7aa0bc , < 51860e423592893cd7bfa7287d99a3aff4dc3a9d (git)
Affected: cc15ff3275694fedc33cd3d53212a43eec7aa0bc , < a09d07ac45e283c9861a9ceea06f56d0ba851d22 (git)
Affected: cc15ff3275694fedc33cd3d53212a43eec7aa0bc , < 72d8d1c36452a4d3ee134b1da48de7518c1329f9 (git)
Affected: cc15ff3275694fedc33cd3d53212a43eec7aa0bc , < 6dcd072a5ae3aed336e4a67a7d4cc5205b240065 (git)
Affected: cc15ff3275694fedc33cd3d53212a43eec7aa0bc , < 8079acc5ee5235a627e4586d4f42082a9000ea64 (git)
Affected: cc15ff3275694fedc33cd3d53212a43eec7aa0bc , < 31467b23823ffec1f6fff407f8e3ca9af8b7491a (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/time: Remove redundant preempt_disable|enable() calls from arch_irq_work_raise()\n\nA kernel panic is observed when handling machine check exceptions from\nreal mode.\n\n  BUG: Unable to handle kernel data access on read at 0xc00000006be21300\n  Oops: Kernel access of bad area, sig: 11 [#1]\n  MSR:  8000000000001003 \u003cSF,ME,RI,LE\u003e  CR: 88222248  XER: 00000005\n  CFAR: c00000000003ffc4 DAR: c00000006be21300 DSISR: 40000000 IRQMASK: 0\n  NIP [c000000000029e40] arch_irq_work_raise+0x10/0x70\n  LR [c00000000003ffc8] machine_check_queue_event+0xa8/0x150\n  Call Trace:\n  [c0000000179d3c70] [c00000000003ff64] machine_check_queue_event+0x44/0x150\n  [c0000000179d3d30] [c0000000000084e0] machine_check_early_common+0x1f0/0x2c0\n\nThe crash occurs because arch_irq_work_raise() calls preempt_disable()\nfrom machine check exception (MCE) handlers running in real mode. In\nthis context, accessing the preempt_count can fault, leading to the panic.\n\nThe preempt_disable()/preempt_enable() pair in arch_irq_work_raise()\nwas originally added by commit 0fe1ac48bef0 (\"powerpc/perf_event: Fix\noops due to perf_event_do_pending call\") to avoid races while raising\nirq work from exception context.\n\nLater, commit 471ba0e686cb (\"irq_work: Do not raise an IPI when\nqueueing work on the local CPU\") added preemption protection in\nirq_work_queue() path, while commit 20b876918c06 (\"irq_work: Use per\ncpu atomics instead of regular atomics\") added equivalent\nprotection in irq_work_queue_on() before reaching arch_irq_work_raise():\n\n  irq_work_queue() / irq_work_queue_on()\n    -\u003e preempt_disable()\n      -\u003e __irq_work_queue_local()\n        -\u003e irq_work_raise()\n          -\u003e arch_irq_work_raise()\n\nAs a result, callers other than mce_irq_work_raise() already execute\nwith preemption disabled, making the additional\npreempt_disable()/preempt_enable() pair in arch_irq_work_raise()\nredundant.\n\nThe arch_irq_work_raise() function executes in NMI context when called\nfrom MCE handler. Hence we will not be preempted or scheduled out since\nwe are in NMI context with MSR[EE]=0. Therefore, it is safe to remove\nthe preempt_disable()/preempt_enable() calls from here.\n\nRemove it to avoid accessing preempt_count from real mode context.\n\n[Maddy: Fixed the commit title]"
        }
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        "dateUpdated": "2026-07-24T15:23:03.529Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/a09d07ac45e283c9861a9ceea06f56d0ba851d22"
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        },
        {
          "url": "https://git.kernel.org/stable/c/31467b23823ffec1f6fff407f8e3ca9af8b7491a"
        }
      ],
      "title": "powerpc/time: Remove redundant preempt_disable|enable() calls from arch_irq_work_raise()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64214",
    "datePublished": "2026-07-24T15:23:03.529Z",
    "dateReserved": "2026-07-19T15:36:31.770Z",
    "dateUpdated": "2026-07-24T15:23:03.529Z",
    "state": "PUBLISHED"
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      "date": "2026-08-01",
      "epss": "0.00173",
      "percentile": "0.0697"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64214\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-24T16:16:49.053\",\"lastModified\":\"2026-07-30T14:59:47.950\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/time: Remove redundant preempt_disable|enable() calls from arch_irq_work_raise()\\n\\nA kernel panic is observed when handling machine check exceptions from\\nreal mode.\\n\\n  BUG: Unable to handle kernel data access on read at 0xc00000006be21300\\n  Oops: Kernel access of bad area, sig: 11 [#1]\\n  MSR:  8000000000001003 \u003cSF,ME,RI,LE\u003e  CR: 88222248  XER: 00000005\\n  CFAR: c00000000003ffc4 DAR: c00000006be21300 DSISR: 40000000 IRQMASK: 0\\n  NIP [c000000000029e40] arch_irq_work_raise+0x10/0x70\\n  LR [c00000000003ffc8] machine_check_queue_event+0xa8/0x150\\n  Call Trace:\\n  [c0000000179d3c70] [c00000000003ff64] machine_check_queue_event+0x44/0x150\\n  [c0000000179d3d30] [c0000000000084e0] machine_check_early_common+0x1f0/0x2c0\\n\\nThe crash occurs because arch_irq_work_raise() calls preempt_disable()\\nfrom machine check exception (MCE) handlers running in real mode. In\\nthis context, accessing the preempt_count can fault, leading to the panic.\\n\\nThe preempt_disable()/preempt_enable() pair in arch_irq_work_raise()\\nwas originally added by commit 0fe1ac48bef0 (\\\"powerpc/perf_event: Fix\\noops due to perf_event_do_pending call\\\") to avoid races while raising\\nirq work from exception context.\\n\\nLater, commit 471ba0e686cb (\\\"irq_work: Do not raise an IPI when\\nqueueing work on the local CPU\\\") added preemption protection in\\nirq_work_queue() path, while commit 20b876918c06 (\\\"irq_work: Use per\\ncpu atomics instead of regular atomics\\\") added equivalent\\nprotection in irq_work_queue_on() before reaching arch_irq_work_raise():\\n\\n  irq_work_queue() / irq_work_queue_on()\\n    -\u003e preempt_disable()\\n      -\u003e __irq_work_queue_local()\\n        -\u003e irq_work_raise()\\n          -\u003e arch_irq_work_raise()\\n\\nAs a result, callers other than mce_irq_work_raise() already execute\\nwith preemption disabled, making the additional\\npreempt_disable()/preempt_enable() pair in arch_irq_work_raise()\\nredundant.\\n\\nThe arch_irq_work_raise() function executes in NMI context when called\\nfrom MCE handler. Hence we will not be preempted or scheduled out since\\nwe are in NMI context with MSR[EE]=0. Therefore, it is safe to remove\\nthe preempt_disable()/preempt_enable() calls from here.\\n\\nRemove it to avoid accessing preempt_count from real mode context.\\n\\n[Maddy: Fixed the commit title]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/powerpc/kernel/time.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cc15ff3275694fedc33cd3d53212a43eec7aa0bc\",\"lessThan\":\"51860e423592893cd7bfa7287d99a3aff4dc3a9d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc15ff3275694fedc33cd3d53212a43eec7aa0bc\",\"lessThan\":\"a09d07ac45e283c9861a9ceea06f56d0ba851d22\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc15ff3275694fedc33cd3d53212a43eec7aa0bc\",\"lessThan\":\"72d8d1c36452a4d3ee134b1da48de7518c1329f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc15ff3275694fedc33cd3d53212a43eec7aa0bc\",\"lessThan\":\"6dcd072a5ae3aed336e4a67a7d4cc5205b240065\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc15ff3275694fedc33cd3d53212a43eec7aa0bc\",\"lessThan\":\"8079acc5ee5235a627e4586d4f42082a9000ea64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc15ff3275694fedc33cd3d53212a43eec7aa0bc\",\"lessThan\":\"31467b23823ffec1f6fff407f8e3ca9af8b7491a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/powerpc/kernel/time.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/31467b23823ffec1f6fff407f8e3ca9af8b7491a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51860e423592893cd7bfa7287d99a3aff4dc3a9d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6dcd072a5ae3aed336e4a67a7d4cc5205b240065\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72d8d1c36452a4d3ee134b1da48de7518c1329f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8079acc5ee5235a627e4586d4f42082a9000ea64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a09d07ac45e283c9861a9ceea06f56d0ba851d22\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-28T10:27:07+00:00",
      "cve": "CVE-2026-64214",
      "id": "CVE-2026-64214",
      "initial_release_date": "2026-07-24T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/time: Remove redundant preempt_disable|enable() calls from arch_irq_work_raise()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64214.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-28T17:09:14Z",
      "cve": "CVE-2026-64214",
      "id": "CVE-2026-64214",
      "initial_release_date": "2026-07-25T00:14:25Z",
      "product_status:known_affected": "131",
      "product_status:known_not_affected": "167",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64214",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64214.json",
      "version": "3"
    }
  }
}



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