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CVE-2024-35801 (GCVE-0-2024-35801)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2026-05-11 20:11
VLAI
Title
x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-03 16:40 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 672365477ae8afca5a1cca98c1deb733235e4525 , < 21c7c00dae55cb0e3810d5f9506b58f68475d41d (git)
Affected: 672365477ae8afca5a1cca98c1deb733235e4525 , < 1acbca933313aa866e39996904c9aca4d435c4cd (git)
Affected: 672365477ae8afca5a1cca98c1deb733235e4525 , < 92b0f04e937665bde5768f3fcc622dcce44413d8 (git)
Affected: 672365477ae8afca5a1cca98c1deb733235e4525 , < b61e3b7055ac6edee4be071c52f48c26472d2624 (git)
Affected: 672365477ae8afca5a1cca98c1deb733235e4525 , < 10e4b5166df9ff7a2d5316138ca668b42d004422 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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linux linux_kernel Affected: 672365477ae8 , < 21c7c00dae55 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 672365477ae8 , < 1acbca933313 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 672365477ae8 , < 92b0f04e9376 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 672365477ae8 , < b61e3b7055ac (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 672365477ae8 , < 10e4b5166df9 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 0 , < 5.16 (custom)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 6.6.24 , < 6.7 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 6.7.12 , < 6.8 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 6.8.3 , < 6.9 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 6.9
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 5.16
    cpe:2.3:o:linux:linux_kernel:5.16:-:*:*:*:*:*:*
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linux linux_kernel Unaffected: 6.1.84 , < 6.2 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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    "microsoft_vex": {
      "current_release_date": "2026-02-18T02:30:36.000Z",
      "cve": "CVE-2024-35801",
      "id": "msrc_CVE-2024-35801",
      "initial_release_date": "2024-05-02T07:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-35801.json",
      "version": "2"
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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 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[{\"status\": \"unaffected\", \"version\": \"6.8.3\", \"lessThan\": \"6.9\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.9\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:5.16:-:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.16\"}], \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.1.84\", \"lessThan\": \"6.2\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-03T16:56:51.808Z\"}}], \"cna\": {\"title\": \"x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"672365477ae8\", \"lessThan\": \"21c7c00dae55\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"672365477ae8\", \"lessThan\": \"1acbca933313\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"672365477ae8\", \"lessThan\": \"92b0f04e9376\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"672365477ae8\", \"lessThan\": \"b61e3b7055ac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"672365477ae8\", \"lessThan\": \"10e4b5166df9\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/x86/kernel/fpu/xstate.c\", \"arch/x86/kernel/fpu/xstate.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.16\", \"versionType\": \"custom\"}, {\"status\": \"unaffected\", \"version\": \"6.1.84\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.24\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.12\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/kernel/fpu/xstate.c\", \"arch/x86/kernel/fpu/xstate.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d\"}, {\"url\": \"https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd\"}, {\"url\": \"https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8\"}, {\"url\": \"https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624\"}, {\"url\": \"https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422\"}], \"x_generator\": {\"engine\": \"bippy-a5840b7849dd\"}, \"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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:29:14.230Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35801\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-02T03:21:47.620Z\", \"dateReserved\": \"2024-05-17T12:19:12.341Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T13:23:10.830Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.