CVE-2024-42240 (GCVE-0-2024-42240)
Vulnerability from cvelistv5 – Published: 2024-08-07 15:14 – Updated: 2026-05-23 15:52
VLAI
EPSS
VEX
Title
x86/bhi: Avoid warning in #DB handler due to BHI mitigation
Summary
In the Linux kernel, the following vulnerability has been resolved:
x86/bhi: Avoid warning in #DB handler due to BHI mitigation
When BHI mitigation is enabled, if SYSENTER is invoked with the TF flag set
then entry_SYSENTER_compat() uses CLEAR_BRANCH_HISTORY and calls the
clear_bhb_loop() before the TF flag is cleared. This causes the #DB handler
(exc_debug_kernel()) to issue a warning because single-step is used outside the
entry_SYSENTER_compat() function.
To address this issue, entry_SYSENTER_compat() should use CLEAR_BRANCH_HISTORY
after making sure the TF flag is cleared.
The problem can be reproduced with the following sequence:
$ cat sysenter_step.c
int main()
{ asm("pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter"); }
$ gcc -o sysenter_step sysenter_step.c
$ ./sysenter_step
Segmentation fault (core dumped)
The program is expected to crash, and the #DB handler will issue a warning.
Kernel log:
WARNING: CPU: 27 PID: 7000 at arch/x86/kernel/traps.c:1009 exc_debug_kernel+0xd2/0x160
...
RIP: 0010:exc_debug_kernel+0xd2/0x160
...
Call Trace:
<#DB>
? show_regs+0x68/0x80
? __warn+0x8c/0x140
? exc_debug_kernel+0xd2/0x160
? report_bug+0x175/0x1a0
? handle_bug+0x44/0x90
? exc_invalid_op+0x1c/0x70
? asm_exc_invalid_op+0x1f/0x30
? exc_debug_kernel+0xd2/0x160
exc_debug+0x43/0x50
asm_exc_debug+0x1e/0x40
RIP: 0010:clear_bhb_loop+0x0/0xb0
...
</#DB>
<TASK>
? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d
</TASK>
[ bp: Massage commit message. ]
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:13 UTC
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
bd53ec80f21839cfd4d852a6088279d602d67e5b , < db56615e96c439e13783d7715330e824b4fd4b84
(git)
Affected: 07dbb10f153f483e8249acebdffedf922e2ec2e1 , < a765679defe1dc1b8fa01928a6ad6361e72a1364 (git) Affected: eb36b0dce2138581bc6b5e39d0273cb4c96ded81 , < dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf (git) Affected: 7390db8aea0d64e9deb28b8e1ce716f5020c7ee5 , < 08518d48e5b744620524f0acd7c26c19bda7f513 (git) Affected: 7390db8aea0d64e9deb28b8e1ce716f5020c7ee5 , < ac8b270b61d48fcc61f052097777e3b5e11591e0 (git) Affected: 8f51637712e4da5be410a1666f8aee0d86eef898 (git) Affected: 5.15.154 , < 5.15.163 (semver) Affected: 6.1.85 , < 6.1.100 (semver) Affected: 6.6.26 , < 6.6.41 (semver) Affected: 6.8.5 , < 6.9 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 5.15.163 , ≤ 5.15.* (semver) Unaffected: 6.1.100 , ≤ 6.1.* (semver) Unaffected: 6.6.41 , ≤ 6.6.* (semver) Unaffected: 6.9.10 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/bhi: Avoid warning in #DB handler due to BHI mitigation\n\nWhen BHI mitigation is enabled, if SYSENTER is invoked with the TF flag set\nthen entry_SYSENTER_compat() uses CLEAR_BRANCH_HISTORY and calls the\nclear_bhb_loop() before the TF flag is cleared. This causes the #DB handler\n(exc_debug_kernel()) to issue a warning because single-step is used outside the\nentry_SYSENTER_compat() function.\n\nTo address this issue, entry_SYSENTER_compat() should use CLEAR_BRANCH_HISTORY\nafter making sure the TF flag is cleared.\n\nThe problem can be reproduced with the following sequence:\n\n $ cat sysenter_step.c\n int main()\n { asm(\"pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter\"); }\n\n $ gcc -o sysenter_step sysenter_step.c\n\n $ ./sysenter_step\n Segmentation fault (core dumped)\n\nThe program is expected to crash, and the #DB handler will issue a warning.\n\nKernel log:\n\n WARNING: CPU: 27 PID: 7000 at arch/x86/kernel/traps.c:1009 exc_debug_kernel+0xd2/0x160\n ...\n RIP: 0010:exc_debug_kernel+0xd2/0x160\n ...\n Call Trace:\n \u003c#DB\u003e\n ? show_regs+0x68/0x80\n ? __warn+0x8c/0x140\n ? exc_debug_kernel+0xd2/0x160\n ? report_bug+0x175/0x1a0\n ? handle_bug+0x44/0x90\n ? exc_invalid_op+0x1c/0x70\n ? asm_exc_invalid_op+0x1f/0x30\n ? exc_debug_kernel+0xd2/0x160\n exc_debug+0x43/0x50\n asm_exc_debug+0x1e/0x40\n RIP: 0010:clear_bhb_loop+0x0/0xb0\n ...\n \u003c/#DB\u003e\n \u003cTASK\u003e\n ? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d\n \u003c/TASK\u003e\n\n [ bp: Massage commit message. ]"
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"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: x86/bhi: evitar advertencia en el controlador #DB debido a la mitigaci\u00f3n de BHI Cuando la mitigaci\u00f3n de BHI est\u00e1 habilitada, si se invoca SYSENTER con el indicador TF configurado, entonces Entry_SYSENTER_compat() usa CLEAR_BRANCH_HISTORY y llama al clear_bhb_loop() antes de que se borre la bandera TF. Esto hace que el controlador #DB (exc_debug_kernel()) emita una advertencia porque se utiliza un solo paso fuera de la funci\u00f3n Entry_SYSENTER_compat(). Para solucionar este problema, Entry_SYSENTER_compat() debe usar CLEAR_BRANCH_HISTORY despu\u00e9s de asegurarse de que el indicador TF est\u00e9 borrado. El problema se puede reproducir con la siguiente secuencia: $ cat sysenter_step.c int main() { asm(\"pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter\"); } $ gcc -o sysenter_step sysenter_step.c $ ./sysenter_step Fallo de segmentaci\u00f3n (n\u00facleo volcado) Se espera que el programa falle y el controlador #DB emitir\u00e1 una advertencia. Registro del kernel: ADVERTENCIA: CPU: 27 PID: 7000 en arch/x86/kernel/traps.c:1009 exc_debug_kernel+0xd2/0x160... RIP: 0010:exc_debug_kernel+0xd2/0x160... Seguimiento de llamadas: \u0026lt;#DB\u0026gt; ? show_regs+0x68/0x80? __advertir+0x8c/0x140 ? exc_debug_kernel+0xd2/0x160? report_bug+0x175/0x1a0? handle_bug+0x44/0x90? exc_invalid_op+0x1c/0x70? asm_exc_invalid_op+0x1f/0x30? exc_debug_kernel+0xd2/0x160 exc_debug+0x43/0x50 asm_exc_debug+0x1e/0x40 RIP: 0010:clear_bhb_loop+0x0/0xb0 ... ? Entry_SYSENTER_compat_after_hwframe+0x6e/0x8d [bp: mensaje de commit de masaje. ]"
}
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"id": "CVE-2024-42240",
"lastModified": "2026-06-17T07:49:05.100",
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"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2024-42240",
"options": [
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"exploitation": "none"
},
{
"automatable": "no"
},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T16:13:51.001454Z",
"version": "2.0.3"
}
}
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"published": "2024-08-07T16:15:46.810",
"references": [
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"tags": [
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],
"url": "https://git.kernel.org/stable/c/08518d48e5b744620524f0acd7c26c19bda7f513"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/a765679defe1dc1b8fa01928a6ad6361e72a1364"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/ac8b270b61d48fcc61f052097777e3b5e11591e0"
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{
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"tags": [
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"url": "https://git.kernel.org/stable/c/dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf"
},
{
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"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/db56615e96c439e13783d7715330e824b4fd4b84"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-02T01:27:39+00:00",
"cve": "CVE-2024-42240",
"id": "CVE-2024-42240",
"initial_release_date": "2024-08-07T00:00:00+00:00",
"product_status:fixed": "1005",
"product_status:known_affected": "22",
"product_status:known_not_affected": "51",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: x86/bhi: Avoid warning in #DB handler due to BHI mitigation",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-42240.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2025-11-03T22:02:42.210Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
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"references": [
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}
],
"title": "CVE Program Container"
},
{
"metrics": [
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"other": {
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"id": "CVE-2024-42240",
"options": [
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"Exploitation": "none"
},
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},
{
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],
"role": "CISA Coordinator",
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"version": "2.0.3"
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"dateUpdated": "2024-09-11T12:42:24.229Z",
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"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/entry/entry_64_compat.S"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
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{
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"status": "affected",
"version": "eb36b0dce2138581bc6b5e39d0273cb4c96ded81",
"versionType": "git"
},
{
"lessThan": "08518d48e5b744620524f0acd7c26c19bda7f513",
"status": "affected",
"version": "7390db8aea0d64e9deb28b8e1ce716f5020c7ee5",
"versionType": "git"
},
{
"lessThan": "ac8b270b61d48fcc61f052097777e3b5e11591e0",
"status": "affected",
"version": "7390db8aea0d64e9deb28b8e1ce716f5020c7ee5",
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},
{
"status": "affected",
"version": "8f51637712e4da5be410a1666f8aee0d86eef898",
"versionType": "git"
},
{
"lessThan": "5.15.163",
"status": "affected",
"version": "5.15.154",
"versionType": "semver"
},
{
"lessThan": "6.1.100",
"status": "affected",
"version": "6.1.85",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.6.26",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.8.5",
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},
{
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"product": "Linux",
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.163",
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},
{
"lessThanOrEqual": "6.1.*",
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"version": "6.1.100",
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},
{
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"status": "unaffected",
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},
{
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"status": "unaffected",
"version": "6.9.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/bhi: Avoid warning in #DB handler due to BHI mitigation\n\nWhen BHI mitigation is enabled, if SYSENTER is invoked with the TF flag set\nthen entry_SYSENTER_compat() uses CLEAR_BRANCH_HISTORY and calls the\nclear_bhb_loop() before the TF flag is cleared. This causes the #DB handler\n(exc_debug_kernel()) to issue a warning because single-step is used outside the\nentry_SYSENTER_compat() function.\n\nTo address this issue, entry_SYSENTER_compat() should use CLEAR_BRANCH_HISTORY\nafter making sure the TF flag is cleared.\n\nThe problem can be reproduced with the following sequence:\n\n $ cat sysenter_step.c\n int main()\n { asm(\"pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter\"); }\n\n $ gcc -o sysenter_step sysenter_step.c\n\n $ ./sysenter_step\n Segmentation fault (core dumped)\n\nThe program is expected to crash, and the #DB handler will issue a warning.\n\nKernel log:\n\n WARNING: CPU: 27 PID: 7000 at arch/x86/kernel/traps.c:1009 exc_debug_kernel+0xd2/0x160\n ...\n RIP: 0010:exc_debug_kernel+0xd2/0x160\n ...\n Call Trace:\n \u003c#DB\u003e\n ? show_regs+0x68/0x80\n ? __warn+0x8c/0x140\n ? exc_debug_kernel+0xd2/0x160\n ? report_bug+0x175/0x1a0\n ? handle_bug+0x44/0x90\n ? exc_invalid_op+0x1c/0x70\n ? asm_exc_invalid_op+0x1f/0x30\n ? exc_debug_kernel+0xd2/0x160\n exc_debug+0x43/0x50\n asm_exc_debug+0x1e/0x40\n RIP: 0010:clear_bhb_loop+0x0/0xb0\n ...\n \u003c/#DB\u003e\n \u003cTASK\u003e\n ? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d\n \u003c/TASK\u003e\n\n [ bp: Massage commit message. ]"
}
],
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"references": [
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{
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},
{
"url": "https://git.kernel.org/stable/c/ac8b270b61d48fcc61f052097777e3b5e11591e0"
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"title": "x86/bhi: Avoid warning in #DB handler due to BHI mitigation",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-42240",
"datePublished": "2024-08-07T15:14:27.977Z",
"dateReserved": "2024-07-30T07:40:12.253Z",
"dateUpdated": "2026-05-23T15:52:28.123Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.