{"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":"2025-11-03T22:01:57.533Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-21T09:12:58.986Z"},"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":"2024-09-11T17:33:04.533Z"}}]}}