{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-42126", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-29T15:50:41.179Z", "datePublished": "2024-07-30T07:46:23.179Z", "dateUpdated": "2026-05-11T20:27:29.815Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:27:29.815Z" }, "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't 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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/powerpc/include/asm/interrupt.h", "arch/powerpc/include/asm/percpu.h", "arch/powerpc/kernel/setup_64.c" ], "versions": [ { "version": "eb553f16973ade990d05946af9ae191394712c8a", "lessThan": "fb6675db04c4b79883373edc578d5df7bbc84848", "status": "affected", "versionType": "git" }, { "version": "eb553f16973ade990d05946af9ae191394712c8a", "lessThan": "e2afb26615adf6c3ceaaa7732aa839bcd587a057", "status": "affected", "versionType": "git" }, { "version": "eb553f16973ade990d05946af9ae191394712c8a", "lessThan": "8d3f83dfb23674540c827a8d65fba20aa300b252", "status": "affected", "versionType": "git" }, { "version": "eb553f16973ade990d05946af9ae191394712c8a", "lessThan": "0f37946c62c48a907625348cbc720a7a0c547d1e", "status": "affected", "versionType": "git" }, { "version": "eb553f16973ade990d05946af9ae191394712c8a", "lessThan": "2c78c9411e685dbc9eac8c2845111b03501975b8", "status": "affected", "versionType": "git" }, { "version": "eb553f16973ade990d05946af9ae191394712c8a", "lessThan": "0db880fc865ffb522141ced4bfa66c12ab1fbb70", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/powerpc/include/asm/interrupt.h", "arch/powerpc/include/asm/percpu.h", "arch/powerpc/kernel/setup_64.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.224", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.165", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.98", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.39", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.9", "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": "5.10", "versionEndExcluding": "5.10.224" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.98" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.9.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fb6675db04c4b79883373edc578d5df7bbc84848" }, { "url": "https://git.kernel.org/stable/c/e2afb26615adf6c3ceaaa7732aa839bcd587a057" }, { "url": "https://git.kernel.org/stable/c/8d3f83dfb23674540c827a8d65fba20aa300b252" }, { "url": "https://git.kernel.org/stable/c/0f37946c62c48a907625348cbc720a7a0c547d1e" }, { "url": "https://git.kernel.org/stable/c/2c78c9411e685dbc9eac8c2845111b03501975b8" }, { "url": "https://git.kernel.org/stable/c/0db880fc865ffb522141ced4bfa66c12ab1fbb70" } ], "title": "powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt.", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8d3f83dfb23674540c827a8d65fba20aa300b252", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/0f37946c62c48a907625348cbc720a7a0c547d1e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2c78c9411e685dbc9eac8c2845111b03501975b8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/0db880fc865ffb522141ced4bfa66c12ab1fbb70", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:01:57.533Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-42126", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:16:41.546139Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": 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