CVE-2026-80727 (GCVE-0-2026-80727)
Vulnerability from cvelistv5
Published
2026-09-03 08:21
Modified
2026-09-03 08:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/mce: Set up the polling timer before CMCI discovery I hit the following on one of my machines: mce: CPU0 BANK15 CMCI inherited storm ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: (____ptrval____) object type: timer_list hint: 0x0 WARNING: lib/debugobjects.c:632 at debug_object_assert_init+0x178/0x230, CPU#0: swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc5 #3 PREEMPTLAZY RIP: 0010:debug_object_assert_init+0x18f/0x230 Call Trace: <TASK> __mod_timer mce_timer_kick cmci_discover intel_init_cmci mce_intel_feature_init mcheck_cpu_init identify_cpu identify_boot_cpu arch_cpu_finalize_init start_kernel A second splat follows right after, from timer_setup() finding that same timer already queued: ODEBUG: init active (active state 0) object: (____ptrval____) object type: timer_list hint: stub_timer+0x0/0x10 This is happening because CMCI storm detection is trying to modify the timer before latter was properly set up. Set up the timer first. __mcheck_cpu_setup_timer() only calls timer_setup(), and depends on neither the generic nor the vendor init. [ bp: Massage commit message. ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 1f68ce2a027250aeeb1756391110cdc4dc97c797
Version: 1f68ce2a027250aeeb1756391110cdc4dc97c797
Version: 1f68ce2a027250aeeb1756391110cdc4dc97c797
Version: 1f68ce2a027250aeeb1756391110cdc4dc97c797
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/mce/core.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.8"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.18.45",
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                  "vulnerable": true
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                  "versionEndExcluding": "7.1.9",
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mce: Set up the polling timer before CMCI discovery\n\nI hit the following on one of my machines:\n\n  mce: CPU0 BANK15 CMCI inherited storm\n  ------------[ cut here ]------------\n  ODEBUG: assert_init not available (active state 0) object: (____ptrval____) object type: timer_list hint: 0x0\n  WARNING: lib/debugobjects.c:632 at debug_object_assert_init+0x178/0x230, CPU#0: swapper/0/0\n  CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.2.0-rc5 #3 PREEMPTLAZY\n  RIP: 0010:debug_object_assert_init+0x18f/0x230\n  Call Trace:\n   \u003cTASK\u003e\n   __mod_timer\n   mce_timer_kick\n   cmci_discover\n   intel_init_cmci\n   mce_intel_feature_init\n   mcheck_cpu_init\n   identify_cpu\n   identify_boot_cpu\n   arch_cpu_finalize_init\n   start_kernel\n\nA second splat follows right after, from timer_setup() finding that same\ntimer already queued:\n\n  ODEBUG: init active (active state 0) object: (____ptrval____) object type: timer_list hint: stub_timer+0x0/0x10\n\nThis is happening because CMCI storm detection is trying to modify the timer\nbefore latter was properly set up.\n\nSet up the timer first. __mcheck_cpu_setup_timer() only calls timer_setup(),\nand depends on neither the generic nor the vendor init.\n\n  [ bp: Massage commit message. ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-03T08:21:46.523Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/17ab68d0cf6a41bff61b1e13c6141d9e463736ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/e708fc1566ebd4a2d3f2546e6310d64d362db80d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f4cba3947d2f0eceb32727e198ca2c149a653a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a213dfaa2596c1c0dc4dae91c14fbfa499c03223"
        }
      ],
      "title": "x86/mce: Set up the polling timer before CMCI discovery",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80727",
    "datePublished": "2026-09-03T08:21:46.523Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-03T08:21:46.523Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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