FKIE_CVE-2024-35801

Vulnerability from fkie_nvd - Published: 2024-05-17 14:15 - Updated: 2025-09-19 15:44
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD Commit 672365477ae8 ("x86/fpu: Update XFD state where required") and commit 8bf26758ca96 ("x86/fpu: Add XFD state to fpstate") introduced a per CPU variable xfd_state to keep the MSR_IA32_XFD value cached, in order to avoid unnecessary writes to the MSR. On CPU hotplug MSR_IA32_XFD is reset to the init_fpstate.xfd, which wipes out any stale state. But the per CPU cached xfd value is not reset, which brings them out of sync. As a consequence a subsequent xfd_update_state() might fail to update the MSR which in turn can result in XRSTOR raising a #NM in kernel space, which crashes the kernel. To fix this, introduce xfd_set_state() to write xfd_state together with MSR_IA32_XFD, and use it in all places that set MSR_IA32_XFD.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cdPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fpu: Keep xfd_state in sync with MSR_IA32_XFD\n\nCommit 672365477ae8 (\"x86/fpu: Update XFD state where required\") and\ncommit 8bf26758ca96 (\"x86/fpu: Add XFD state to fpstate\") introduced a\nper CPU variable xfd_state to keep the MSR_IA32_XFD value cached, in\norder to avoid unnecessary writes to the MSR.\n\nOn CPU hotplug MSR_IA32_XFD is reset to the init_fpstate.xfd, which\nwipes out any stale state. But the per CPU cached xfd value is not\nreset, which brings them out of sync.\n\nAs a consequence a subsequent xfd_update_state() might fail to update\nthe MSR which in turn can result in XRSTOR raising a #NM in kernel\nspace, which crashes the kernel.\n\nTo fix this, introduce xfd_set_state() to write xfd_state together\nwith MSR_IA32_XFD, and use it in all places that set MSR_IA32_XFD."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/fpu: mantenga xfd_state sincronizado con MSR_IA32_XFD Confirme 672365477ae8 (\"x86/fpu: actualice el estado de XFD cuando sea necesario\") y confirme 8bf26758ca96 (\"x86/fpu: agregue el estado de XFD a fpstate\") introdujo una variable xfd_state por CPU para mantener el valor MSR_IA32_XFD en cach\u00e9, a fin de evitar escrituras innecesarias en el MSR. En la conexi\u00f3n en caliente de la CPU, MSR_IA32_XFD se restablece a init_fpstate.xfd, lo que elimina cualquier estado obsoleto. Pero el valor xfd almacenado en cach\u00e9 por CPU no se restablece, lo que los desincroniza. Como consecuencia, un xfd_update_state() posterior podr\u00eda no actualizar el MSR, lo que a su vez puede provocar que XRSTOR genere un #NM en el espacio del kernel, lo que bloquea el kernel. Para solucionar este problema, introduzca xfd_set_state() para escribir xfd_state junto con MSR_IA32_XFD y util\u00edcelo en todos los lugares que configuren MSR_IA32_XFD."
    }
  ],
  "id": "CVE-2024-35801",
  "lastModified": "2025-09-19T15:44:30.380",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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  "published": "2024-05-17T14:15:12.827",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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}


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