CVE-2024-35801 (GCVE-0-2024-35801)
Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2026-05-11 20:11
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-03 16:40 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
14 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) |
guessed | |
| 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) |
guessed | |
| linux | linux_kernel |
Affected:
672365477ae8 , < 21c7c00dae55
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
672365477ae8 , < 1acbca933313
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
672365477ae8 , < 92b0f04e9376
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
672365477ae8 , < b61e3b7055ac
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
672365477ae8 , < 10e4b5166df9
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
0 , < 5.16
(custom)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.6.24 , < 6.7
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.7.12 , < 6.8
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.8.3 , < 6.9
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.9
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
5.16
cpe:2.3:o:linux:linux_kernel:5.16:-:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.1.84 , < 6.2
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
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"nvd": "{\"cve\":{\"id\":\"CVE-2024-35801\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-17T14:15:12.827\",\"lastModified\":\"2026-06-17T07:35:24.713\",\"vulnStatus\":\"Analyzed\",\"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 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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T08:24:30+00:00",
"cve": "CVE-2024-35801",
"id": "CVE-2024-35801",
"initial_release_date": "2024-05-17T00:00:00+00:00",
"product_status:fixed": "709",
"product_status:known_affected": "22",
"product_status:known_not_affected": "50",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35801.json",
"version": "3"
},
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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\"}}}",
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"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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