{"id":"CVE-2026-46035","summary":"mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: return NULL early from alloc_frozen_pages_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, alloc_frozen_pages_nolock() called from NMI context can\nre-enter rmqueue() and acquire the zone lock that the interrupted\ncontext is already holding, corrupting the freelists.\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   \u003cNMI\u003e\n   dump_stack_lvl+0x3f/0x60\n   do_raw_spin_trylock+0x41/0x50\n   _raw_spin_trylock+0x24/0x50\n   rmqueue.isra.0+0x2a9/0xa70\n   get_page_from_freelist+0xeb/0x450\n   alloc_frozen_pages_nolock_noprof+0x111/0x1e0\n   allocate_slab+0x42a/0x500\n   ___slab_alloc+0xa7/0x4c0\n   kmalloc_nolock_noprof+0x164/0x310\n   [...]\n   \u003c/NMI\u003e\n\nFix this by returning NULL early when invoked from NMI on a UP kernel.","modified":"2026-06-18T03:56:37.807133467Z","published":"2026-05-27T12:56:44.260Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46035.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/620b46ed6ae17c8438d889c8c0cfddab36a1476c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6d57efeaae3f3b3656514f600eac96be713d90e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46035.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46035"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d7242af8643409aae32243450341ef25b28d8a8c"},{"fixed":"05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4"},{"fixed":"a6d57efeaae3f3b3656514f600eac96be713d90e"},{"fixed":"620b46ed6ae17c8438d889c8c0cfddab36a1476c"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46035.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46035.json"}}],"schema_version":"1.7.5"}