cve-2024-35801
Vulnerability from cvelistv5
Published
2024-05-17 13:23
Modified
2024-11-05 09:22
Summary
x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


{
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              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
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              "userInteraction": "NONE",
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              "version": "3.1"
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                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-06-03T16:40:36.565439Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "problemTypes": [
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                "description": "CWE-416 Use After Free",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
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        "title": "CVE Program Container"
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    ],
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/fpu/xstate.c",
            "arch/x86/kernel/fpu/xstate.h"
          ],
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              "version": "6.6.24",
              "versionType": "semver"
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-05T09:22:37.103Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422"
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      "title": "x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-35801",
    "datePublished": "2024-05-17T13:23:10.830Z",
    "dateReserved": "2024-05-17T12:19:12.341Z",
    "dateUpdated": "2024-11-05T09:22:37.103Z",
    "state": "PUBLISHED"
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  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35801\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-17T14:15:12.827\",\"lastModified\":\"2024-07-03T02:02:12.050\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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