FKIE_CVE-2024-42126
Vulnerability from fkie_nvd - Published: 2024-07-30 08:15 - Updated: 2026-06-17 07:48
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt.
nmi_enter()/nmi_exit() touches per cpu variables which can lead to kernel
crash when invoked during real mode interrupt handling (e.g. early HMI/MCE
interrupt handler) if percpu allocation comes from vmalloc area.
Early HMI/MCE handlers are called through DEFINE_INTERRUPT_HANDLER_NMI()
wrapper which invokes nmi_enter/nmi_exit calls. We don't see any issue when
percpu allocation is from the embedded first chunk. However with
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK enabled there are chances where percpu
allocation can come from the vmalloc area.
With kernel command line "percpu_alloc=page" we can force percpu allocation
to come from vmalloc area and can see kernel crash in machine_check_early:
[ 1.215714] NIP [c000000000e49eb4] rcu_nmi_enter+0x24/0x110
[ 1.215717] LR [c0000000000461a0] machine_check_early+0xf0/0x2c0
[ 1.215719] --- interrupt: 200
[ 1.215720] [c000000fffd73180] [0000000000000000] 0x0 (unreliable)
[ 1.215722] [c000000fffd731b0] [0000000000000000] 0x0
[ 1.215724] [c000000fffd73210] [c000000000008364] machine_check_early_common+0x134/0x1f8
Fix this by avoiding use of nmi_enter()/nmi_exit() in real mode if percpu
first chunk is not embedded.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/powerpc/include/asm/interrupt.h",
"arch/powerpc/include/asm/percpu.h",
"arch/powerpc/kernel/setup_64.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "fb6675db04c4b79883373edc578d5df7bbc84848",
"status": "affected",
"version": "eb553f16973ade990d05946af9ae191394712c8a",
"versionType": "git"
},
{
"lessThan": "e2afb26615adf6c3ceaaa7732aa839bcd587a057",
"status": "affected",
"version": "eb553f16973ade990d05946af9ae191394712c8a",
"versionType": "git"
},
{
"lessThan": "8d3f83dfb23674540c827a8d65fba20aa300b252",
"status": "affected",
"version": "eb553f16973ade990d05946af9ae191394712c8a",
"versionType": "git"
},
{
"lessThan": "0f37946c62c48a907625348cbc720a7a0c547d1e",
"status": "affected",
"version": "eb553f16973ade990d05946af9ae191394712c8a",
"versionType": "git"
},
{
"lessThan": "2c78c9411e685dbc9eac8c2845111b03501975b8",
"status": "affected",
"version": "eb553f16973ade990d05946af9ae191394712c8a",
"versionType": "git"
},
{
"lessThan": "0db880fc865ffb522141ced4bfa66c12ab1fbb70",
"status": "affected",
"version": "eb553f16973ade990d05946af9ae191394712c8a",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/powerpc/include/asm/interrupt.h",
"arch/powerpc/include/asm/percpu.h",
"arch/powerpc/kernel/setup_64.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.224",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.165",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.98",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"version": "6.9.9",
"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": "3723F85C-99C4-4BA1-A411-426E0591769E",
"versionEndExcluding": "5.10.224",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B4E2B568-3171-41DE-B519-F2B1A3600D94",
"versionEndExcluding": "5.15.165",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E09E92A5-27EF-40E4-926A-B1CDC8270551",
"versionEndExcluding": "6.1.98",
"versionStartIncluding": "5.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "29E894E4-668F-4DB0-81F7-4FB5F698E970",
"versionEndExcluding": "6.6.39",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "ADCC1407-0CB3-4C8F-B4C5-07F682CD7085",
"versionEndExcluding": "6.9.9",
"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\npowerpc: Avoid nmi_enter/nmi_exit in real mode interrupt.\n\nnmi_enter()/nmi_exit() touches per cpu variables which can lead to kernel\ncrash when invoked during real mode interrupt handling (e.g. early HMI/MCE\ninterrupt handler) if percpu allocation comes from vmalloc area.\n\nEarly HMI/MCE handlers are called through DEFINE_INTERRUPT_HANDLER_NMI()\nwrapper which invokes nmi_enter/nmi_exit calls. We don\u0027t see any issue when\npercpu allocation is from the embedded first chunk. However with\nCONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK enabled there are chances where percpu\nallocation can come from the vmalloc area.\n\nWith kernel command line \"percpu_alloc=page\" we can force percpu allocation\nto come from vmalloc area and can see kernel crash in machine_check_early:\n\n[ 1.215714] NIP [c000000000e49eb4] rcu_nmi_enter+0x24/0x110\n[ 1.215717] LR [c0000000000461a0] machine_check_early+0xf0/0x2c0\n[ 1.215719] --- interrupt: 200\n[ 1.215720] [c000000fffd73180] [0000000000000000] 0x0 (unreliable)\n[ 1.215722] [c000000fffd731b0] [0000000000000000] 0x0\n[ 1.215724] [c000000fffd73210] [c000000000008364] machine_check_early_common+0x134/0x1f8\n\nFix this by avoiding use of nmi_enter()/nmi_exit() in real mode if percpu\nfirst chunk is not embedded."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc: Evite nmi_enter/nmi_exit en interrupci\u00f3n en modo real. nmi_enter()/nmi_exit() toca variables por CPU que pueden provocar un fallo del kernel cuando se invoca durante el manejo de interrupciones en modo real (por ejemplo, el controlador de interrupciones HMI/MCE temprano) si la asignaci\u00f3n de percpu proviene del \u00e1rea vmalloc. Los primeros controladores HMI/MCE se llaman a trav\u00e9s del contenedor DEFINE_INTERRUPT_HANDLER_NMI() que invoca llamadas nmi_enter/nmi_exit. No vemos ning\u00fan problema cuando la asignaci\u00f3n de percpu proviene del primer fragmento integrado. Sin embargo, con CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK habilitado, hay posibilidades de que la asignaci\u00f3n de percpu pueda provenir del \u00e1rea vmalloc. Con la l\u00ednea de comando del kernel \"percpu_alloc=page\" podemos forzar que la asignaci\u00f3n de percpu provenga del \u00e1rea vmalloc y podemos ver el fallo del kernel en machine_check_early: [1.215714] NIP [c000000000e49eb4] rcu_nmi_enter+0x24/0x110 [1.215717] LR [c0000000000461a0] check_early+0xf0/ 0x2c0 [1.215719] --- interrupci\u00f3n: 200 [ 1.215720] [c000000fffd73180] [0000000000000000] 0x0 (no confiable) [ 1.215722] [c000000fffd731b0] 000] 0x0 [ 1.215724] [c000000fffd73210] [c000000000008364] machine_check_early_common+0x134/0x1f8 Solucionar esto mediante evitando el uso de nmi_enter()/nmi_exit() en modo real si el primer fragmento de percpu no est\u00e1 incrustado."
}
],
"id": "CVE-2024-42126",
"lastModified": "2026-06-17T07:48:53.340",
"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-2024-42126",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T16:16:41.546139Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-07-30T08:15:04.743",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0db880fc865ffb522141ced4bfa66c12ab1fbb70"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0f37946c62c48a907625348cbc720a7a0c547d1e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2c78c9411e685dbc9eac8c2845111b03501975b8"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/8d3f83dfb23674540c827a8d65fba20aa300b252"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e2afb26615adf6c3ceaaa7732aa839bcd587a057"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/fb6675db04c4b79883373edc578d5df7bbc84848"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0db880fc865ffb522141ced4bfa66c12ab1fbb70"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0f37946c62c48a907625348cbc720a7a0c547d1e"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2c78c9411e685dbc9eac8c2845111b03501975b8"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/8d3f83dfb23674540c827a8d65fba20aa300b252"
},
{
"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": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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