{"cve":"CVE-2026-46035","nvd":{"published":"2026-05-27T14:17:22.617","modified":"2026-06-17T10:52:56.383","status":"Analyzed","description":"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   <NMI>\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   </NMI>\n\nFix this by returning NULL early when invoked from NMI on a UP kernel.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4","https://git.kernel.org/stable/c/620b46ed6ae17c8438d889c8c0cfddab36a1476c","https://git.kernel.org/stable/c/a6d57efeaae3f3b3656514f600eac96be713d90e"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-46035","score":0.00121,"percentile":0.01875,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}