{"api_version":"1","generated_at":"2026-07-23T14:30:31+00:00","cve":"CVE-2026-46029","urls":{"html":"https://cve.report/CVE-2026-46029","api":"https://cve.report/api/cve/CVE-2026-46029.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46029","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46029"},"summary":{"title":"mm/slab: return NULL early from kmalloc_nolock() in NMI on UP","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slab: return NULL early from kmalloc_nolock() in NMI on UP\n\nOn UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that\nunconditionally succeeds even when the lock is already held. As a\nresult, kmalloc_nolock() called from NMI context can re-enter the slab\nallocator and acquire n->list_lock that the interrupted context is\nalready holding, corrupting slab state.\n\nWith CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with\nthe slub_kunit test module:\n\n  BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243\n  [...]\n  Call Trace:\n   <NMI>\n   dump_stack_lvl+0x3f/0x60\n   do_raw_spin_trylock+0x41/0x50\n   _raw_spin_trylock+0x24/0x50\n   get_from_partial_node+0x120/0x4d0\n   ___slab_alloc+0x8a/0x4c0\n   kmalloc_nolock_noprof+0x164/0x310\n   [...]\n   </NMI>\n\nFix this by returning NULL early when invoked from NMI on a UP kernel.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:21","updated_at":"2026-06-16 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46029","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af92793e52c3a99b828ed4bdd277fd3e11c18d08 a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af92793e52c3a99b828ed4bdd277fd3e11c18d08 d66553204a15bdb257d9ef8aca1e12f5fbb910b2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af92793e52c3a99b828ed4bdd277fd3e11c18d08 5b31044e649e3e54c2caef135c09b371c2fbcd08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 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the Linux kernel, the following vulnerability has been resolved:\n\nmm/slab: return NULL early from kmalloc_nolock() in NMI on UP\n\nOn UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that\nunconditionally succeeds even when the lock is already held. As a\nresult, kmalloc_nolock() called from NMI context can re-enter the slab\nallocator and acquire n->list_lock that the interrupted context is\nalready holding, corrupting slab state.\n\nWith CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with\nthe slub_kunit test module:\n\n  BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243\n  [...]\n  Call Trace:\n   <NMI>\n   dump_stack_lvl+0x3f/0x60\n   do_raw_spin_trylock+0x41/0x50\n   _raw_spin_trylock+0x24/0x50\n   get_from_partial_node+0x120/0x4d0\n   ___slab_alloc+0x8a/0x4c0\n   kmalloc_nolock_noprof+0x164/0x310\n   [...]\n   </NMI>\n\nFix this by returning NULL early when invoked from NMI on a UP kernel."}],"metrics":[{"cvssV3_1":{"baseScore":7,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-06-14T17:49:05.766Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7"},{"url":"https://git.kernel.org/stable/c/d66553204a15bdb257d9ef8aca1e12f5fbb910b2"},{"url":"https://git.kernel.org/stable/c/5b31044e649e3e54c2caef135c09b371c2fbcd08"}],"title":"mm/slab: return NULL early from kmalloc_nolock() in NMI on UP","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46029","datePublished":"2026-05-27T12:56:38.376Z","dateReserved":"2026-05-13T15:03:33.093Z","dateUpdated":"2026-06-14T17:49:05.766Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:21","lastModifiedDate":"2026-06-16 15:53:30","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1,"impactScore":5.9}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.27","matchCriteriaId":"1A10DA86-4154-4102-9D63-807CF10A4352"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.4","matchCriteriaId":"CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*","matchCriteriaId":"B1EF7059-E670-45F4-B422-54C40FA86390"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46029","Ordinal":"1","Title":"mm/slab: return NULL early from kmalloc_nolock() in NMI on UP","CVE":"CVE-2026-46029","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46029","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slab: return NULL early from kmalloc_nolock() in NMI on UP\n\nOn UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that\nunconditionally succeeds even when the lock is already held. As a\nresult, kmalloc_nolock() called from NMI context can re-enter the slab\nallocator and acquire n->list_lock that the interrupted context is\nalready holding, corrupting slab state.\n\nWith CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with\nthe slub_kunit test module:\n\n  BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243\n  [...]\n  Call Trace:\n   <NMI>\n   dump_stack_lvl+0x3f/0x60\n   do_raw_spin_trylock+0x41/0x50\n   _raw_spin_trylock+0x24/0x50\n   get_from_partial_node+0x120/0x4d0\n   ___slab_alloc+0x8a/0x4c0\n   kmalloc_nolock_noprof+0x164/0x310\n   [...]\n   </NMI>\n\nFix this by returning NULL early when invoked from NMI on a UP kernel.","Type":"Description","Title":"mm/slab: return NULL early from kmalloc_nolock() in NMI on UP"}]}}}