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CVE-2022-49565

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

perf/x86/intel/lbr: Fix unchecked MSR access error on HSW

The fuzzer triggers the below trace.

On a machine with the LBR format LBR_FORMAT_EIP_FLAGS2, when the TSX is disabled, a TSX quirk is required to access LBR from registers. The lbr_from_signext_quirk_needed() is introduced to determine whether the TSX quirk should be applied. However, the lbr_from_signext_quirk_needed() is invoked before the intel_pmu_lbr_init(), which parses the LBR format information. Without the correct LBR format information, the TSX quirk never be applied.

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Move the lbr_from_signext_quirk_needed() into the intel_pmu_lbr_init(). Checking x86_pmu.lbr_has_tsx in the lbr_from_signext_quirk_needed() is not required anymore.

Both LBR_FORMAT_EIP_FLAGS2 and LBR_FORMAT_INFO have LBR_TSX flag, but only the LBR_FORMAT_EIP_FLAGS2 requirs the quirk. Update the comments accordingly.

Detalles técnicos trazas, registros y código del informe original
[ 7763.384369] unchecked MSR access error: WRMSR to 0x689
(tried to write 0x1fffffff8101349e) at rIP: 0xffffffff810704a4
(native_write_msr+0x4/0x20)
[ 7763.397420] Call Trace:
[ 7763.399881]  <TASK>
[ 7763.401994]  intel_pmu_lbr_restore+0x9a/0x1f0
[ 7763.406363]  intel_pmu_lbr_sched_task+0x91/0x1c0
[ 7763.410992]  __perf_event_task_sched_in+0x1cd/0x240

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49565",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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              "version": "0",
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              "version": "5.18.15",
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              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
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          "programFiles": [
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          "defaultStatus": "affected"
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  "published": "2025-02-26T07:01:32.240",
  "references": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel/lbr: Fix unchecked MSR access error on HSW\n\nThe fuzzer triggers the below trace.\n\n[ 7763.384369] unchecked MSR access error: WRMSR to 0x689\n(tried to write 0x1fffffff8101349e) at rIP: 0xffffffff810704a4\n(native_write_msr+0x4/0x20)\n[ 7763.397420] Call Trace:\n[ 7763.399881]  <TASK>\n[ 7763.401994]  intel_pmu_lbr_restore+0x9a/0x1f0\n[ 7763.406363]  intel_pmu_lbr_sched_task+0x91/0x1c0\n[ 7763.410992]  __perf_event_task_sched_in+0x1cd/0x240\n\nOn a machine with the LBR format LBR_FORMAT_EIP_FLAGS2, when the TSX is\ndisabled, a TSX quirk is required to access LBR from registers.\nThe lbr_from_signext_quirk_needed() is introduced to determine whether\nthe TSX quirk should be applied. However, the\nlbr_from_signext_quirk_needed() is invoked before the\nintel_pmu_lbr_init(), which parses the LBR format information. Without\nthe correct LBR format information, the TSX quirk never be applied.\n\nMove the lbr_from_signext_quirk_needed() into the intel_pmu_lbr_init().\nChecking x86_pmu.lbr_has_tsx in the lbr_from_signext_quirk_needed() is\nnot required anymore.\n\nBoth LBR_FORMAT_EIP_FLAGS2 and LBR_FORMAT_INFO have LBR_TSX flag, but\nonly the LBR_FORMAT_EIP_FLAGS2 requirs the quirk. Update the comments\naccordingly."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: perf/x86/intel/lbr: Se corrige el error de acceso a MSR sin verificar en HSW. El fuzzer activa el siguiente seguimiento. [ 7763.384369] Error de acceso a MSR sin marcar: WRMSR a 0x689 (intentó escribir 0x1fffffff8101349e) en rIP: 0xffffffff810704a4 (native_write_msr+0x4/0x20) [ 7763.397420] Seguimiento de llamadas: [ 7763.399881]  [ 7763.401994] intel_pmu_lbr_restore+0x9a/0x1f0 [ 7763.406363] intel_pmu_lbr_sched_task+0x91/0x1c0 [ 7763.410992] __perf_event_task_sched_in+0x1cd/0x240 Activado una máquina con el formato LBR LBR_FORMAT_EIP_FLAGS2, cuando el TSX está deshabilitado, se requiere una peculiaridad TSX para acceder al LBR desde los registros. Se introduce lbr_from_signext_quirk_needed() para determinar si se debe aplicar la peculiaridad TSX. Sin embargo, lbr_from_signext_quirk_needed() se invoca antes de intel_pmu_lbr_init(), que analiza la información del formato LBR. Sin la información correcta del formato LBR, la peculiaridad TSX nunca se aplicará. Mueva lbr_from_signext_quirk_needed() a intel_pmu_lbr_init(). Ya no es necesario comprobar x86_pmu.lbr_has_tsx en lbr_from_signext_quirk_needed(). Tanto LBR_FORMAT_EIP_FLAGS2 como LBR_FORMAT_INFO tienen el indicador LBR_TSX, pero solo LBR_FORMAT_EIP_FLAGS2 requiere esta característica. Actualice los comentarios en consecuencia."
    }
  ],
  "lastModified": "2026-06-17T05:18:27.970",
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