CVE-2024-42240

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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 <#DB>\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 </#DB>\n <TASK>\n ? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d\n </TASK>\n\n [ bp: Massage commit message. ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/entry/entry_64_compat.S"], "versions": [{"version": "bd53ec80f21839cfd4d852a6088279d602d67e5b", "lessThan": "db56615e96c439e13783d7715330e824b4fd4b84", "status": "affected", "versionType": "git"}, {"version": "07dbb10f153f483e8249acebdffedf922e2ec2e1", "lessThan": "a765679defe1dc1b8fa01928a6ad6361e72a1364", "status": "affected", "versionType": "git"}, {"version": "eb36b0dce2138581bc6b5e39d0273cb4c96ded81", "lessThan": "dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf", "status": "affected", "versionType": "git"}, {"version": "7390db8aea0d64e9deb28b8e1ce716f5020c7ee5", "lessThan": "08518d48e5b744620524f0acd7c26c19bda7f513", "status": "affected", "versionType": "git"}, {"version": "7390db8aea0d64e9deb28b8e1ce716f5020c7ee5", "lessThan": "ac8b270b61d48fcc61f052097777e3b5e11591e0", "status": "affected", "versionType": "git"}, {"version": "8f51637712e4da5be410a1666f8aee0d86eef898", "status": "affected", "versionType": "git"}, {"version": "5.15.154", "lessThan": "5.15.163", "status": "affected", "versionType": "semver"}, {"version": "6.1.85", "lessThan": "6.1.100", "status": "affected", "versionType": "semver"}, {"version": "6.6.26", "lessThan": "6.6.41", "status": "affected", "versionType": "semver"}, {"version": "6.8.5", "lessThan": "6.9", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/entry/entry_64_compat.S"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.163", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.100", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.41", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.10", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.154", "versionEndExcluding": "5.15.163"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.85", "versionEndExcluding": "6.1.100"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.26", "versionEndExcluding": "6.6.41"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.9.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.5"}]}]}], "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"}], "title": "x86/bhi: Avoid warning in #DB handler due to BHI mitigation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:31.693Z"}}, {"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"}}]}}

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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 <#DB>\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 </#DB>\n <TASK>\n ? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d\n </TASK>\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"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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": [{"lessThan": "db56615e96c439e13783d7715330e824b4fd4b84", "status": "affected", "version": "bd53ec80f21839cfd4d852a6088279d602d67e5b", "versionType": "git"}, {"lessThan": "a765679defe1dc1b8fa01928a6ad6361e72a1364", "status": "affected", "version": "07dbb10f153f483e8249acebdffedf922e2ec2e1", "versionType": "git"}, {"lessThan": "dae3543db8f0cf8ac1a198c3bb4b6e3c24d576cf", "status": "affected", "version": "eb36b0dce2138581bc6b5e39d0273cb4c96ded81", "versionType": "git"}, {"lessThan": "08518d48e5b744620524f0acd7c26c19bda7f513", "status": "affected", "version": "7390db8aea0d64e9deb28b8e1ce716f5020c7ee5", "versionType": "git"}, {"lessThan": "ac8b270b61d48fcc61f052097777e3b5e11591e0", "status": "affected", "version": "7390db8aea0d64e9deb28b8e1ce716f5020c7ee5", "versionType": "git"}, {"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"}, {"lessThan": "6.6.41", "status": "affected", "version": "6.6.26", "versionType": "semver"}, {"lessThan": "6.9", "status": "affected", "version": "6.8.5", "versionType": "semver"}]}, {"defaultStatus": "affected", "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": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.163", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.100", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.41", "versionType": "semver"}, {"lessThanOrEqual": "6.9.*", "status": "unaffected", "version": "6.9.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CAAB30CE-506C-42CC-B146-52655F61012E", "versionEndExcluding": "6.1.100", "versionStartIncluding": "5.15.163", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "96AC42B8-D66D-4AC5-B466-E9BA7910FA29", "versionEndExcluding": "6.6.41", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AB2E8DEC-CFD5-4C2B-981D-E7E45A36C352", "versionEndExcluding": "6.9.10", "versionStartIncluding": "6.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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 <#DB>\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 </#DB>\n <TASK>\n ? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d\n </TASK>\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: &lt;#DB&gt; ? 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. ]"}], "id": "CVE-2024-42240", "lastModified": "2026-06-17T07:49:05.100", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "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": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:13:51.001454Z", "version": "2.0.3"}}]}, "published": "2024-08-07T16:15:46.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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": "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"}]}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:10772", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.95.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-12-04T00:00:00Z"}, {"advisory": "RHSA-2024:10773", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.95.1.rt14.380.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-12-04T00:00:00Z"}, {"advisory": "RHSA-2024:10771", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.47.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2024-12-04T00:00:00Z"}], "bugzilla": {"description": "kernel: x86/bhi: Avoid warning in #DB handler due to BHI mitigation", "id": "2303508", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2303508"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/bhi: Avoid warning in #DB handler due to BHI mitigation\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.\nTo address this issue, entry_SYSENTER_compat() should use CLEAR_BRANCH_HISTORY\nafter making sure the TF flag is cleared.\nThe problem can be reproduced with the following sequence:\n$ cat sysenter_step.c\nint main()\n{ asm(\"pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter\"); }\n$ gcc -o sysenter_step sysenter_step.c\n$ ./sysenter_step\nSegmentation fault (core dumped)\nThe program is expected to crash, and the #DB handler will issue a warning.\nKernel log:\nWARNING: CPU: 27 PID: 7000 at arch/x86/kernel/traps.c:1009 exc_debug_kernel+0xd2/0x160\n...\nRIP: 0010:exc_debug_kernel+0xd2/0x160\n...\nCall Trace:\n<#DB>\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\nexc_debug+0x43/0x50\nasm_exc_debug+0x1e/0x40\nRIP: 0010:clear_bhb_loop+0x0/0xb0\n...\n</#DB>\n<TASK>\n? entry_SYSENTER_compat_after_hwframe+0x6e/0x8d\n</TASK>\n[ bp: Massage commit message. ]", "A denial of service vulnerability was found in the Linux kernel. 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 that results in a software crash."], "name": "CVE-2024-42240", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42240\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42240\nhttps://lore.kernel.org/linux-cve-announce/2024080741-CVE-2024-42240-3d04@gregkh/T"], "threat_severity": "Moderate"}

{}