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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"nvd": "{\"cve\":{\"id\":\"CVE-2024-42240\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-07T16:15:46.810\",\"lastModified\":\"2026-06-17T07:49:05.100\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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. ]\"},{\"lang\":\"es\",\"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. ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/x86/entry/entry_64_compat.S\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bd53ec80f21839cfd4d852a6088279d602d67e5b\",\"lessThan\":\"db56615e96c439e13783d7715330e824b4fd4b84\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"07dbb10f153f483e8249acebdffedf922e2ec2e1\",\"lessThan\":\"a765679defe1dc1b8fa01928a6ad6361e72a1364\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eb36b0dce2138581bc6b5e39d0273cb4c96ded81\",\"lessThan\":\"dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7390db8aea0d64e9deb28b8e1ce716f5020c7ee5\",\"lessThan\":\"08518d48e5b744620524f0acd7c26c19bda7f513\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7390db8aea0d64e9deb28b8e1ce716f5020c7ee5\",\"lessThan\":\"ac8b270b61d48fcc61f052097777e3b5e11591e0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f51637712e4da5be410a1666f8aee0d86eef898\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.154\",\"lessThan\":\"5.15.163\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.85\",\"lessThan\":\"6.1.100\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.26\",\"lessThan\":\"6.6.41\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.8.5\",\"lessThan\":\"6.9\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/x86/entry/entry_64_compat.S\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.163\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.100\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.41\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9.10\",\"lessThanOrEqual\":\"6.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T16:13:51.001454Z\",\"id\":\"CVE-2024-42240\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-835\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.163\",\"versionEndExcluding\":\"6.1.100\",\"matchCriteriaId\":\"CAAB30CE-506C-42CC-B146-52655F61012E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.41\",\"matchCriteriaId\":\"96AC42B8-D66D-4AC5-B466-E9BA7910FA29\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.9.10\",\"matchCriteriaId\":\"AB2E8DEC-CFD5-4C2B-981D-E7E45A36C352\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08518d48e5b744620524f0acd7c26c19bda7f513\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a765679defe1dc1b8fa01928a6ad6361e72a1364\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ac8b270b61d48fcc61f052097777e3b5e11591e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/db56615e96c439e13783d7715330e824b4fd4b84\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T08:01:05+00:00",
"cve": "CVE-2024-42240",
"id": "CVE-2024-42240",
"initial_release_date": "2024-08-07T00:00:00+00:00",
"product_status:fixed": "943",
"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\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:02:42.210Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-42240\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:13:51.001454Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:24.229Z\"}}], \"cna\": {\"title\": \"x86/bhi: Avoid warning in #DB handler due to BHI mitigation\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"bd53ec80f21839cfd4d852a6088279d602d67e5b\", \"lessThan\": \"db56615e96c439e13783d7715330e824b4fd4b84\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"07dbb10f153f483e8249acebdffedf922e2ec2e1\", \"lessThan\": \"a765679defe1dc1b8fa01928a6ad6361e72a1364\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eb36b0dce2138581bc6b5e39d0273cb4c96ded81\", \"lessThan\": \"dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7390db8aea0d64e9deb28b8e1ce716f5020c7ee5\", \"lessThan\": \"08518d48e5b744620524f0acd7c26c19bda7f513\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7390db8aea0d64e9deb28b8e1ce716f5020c7ee5\", \"lessThan\": \"ac8b270b61d48fcc61f052097777e3b5e11591e0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8f51637712e4da5be410a1666f8aee0d86eef898\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.15.154\", \"lessThan\": \"5.15.163\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.85\", \"lessThan\": \"6.1.100\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.26\", \"lessThan\": \"6.6.41\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.8.5\", \"lessThan\": \"6.9\", \"versionType\": \"semver\"}], \"programFiles\": [\"arch/x86/entry/entry_64_compat.S\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.100\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.41\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/entry/entry_64_compat.S\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/db56615e96c439e13783d7715330e824b4fd4b84\"}, {\"url\": \"https://git.kernel.org/stable/c/a765679defe1dc1b8fa01928a6ad6361e72a1364\"}, {\"url\": \"https://git.kernel.org/stable/c/dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf\"}, {\"url\": \"https://git.kernel.org/stable/c/08518d48e5b744620524f0acd7c26c19bda7f513\"}, {\"url\": \"https://git.kernel.org/stable/c/ac8b270b61d48fcc61f052097777e3b5e11591e0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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. ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.163\", \"versionStartIncluding\": \"5.15.154\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.100\", \"versionStartIncluding\": \"6.1.85\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.41\", \"versionStartIncluding\": \"6.6.26\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.10\", \"versionStartIncluding\": \"6.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"6.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.8.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:52:28.123Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-42240\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:52:28.123Z\", \"dateReserved\": \"2024-07-30T07:40:12.253Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-07T15:14:27.977Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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