{"id":"CVE-2026-89986","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()\n\nsyzbot reported a sleeping function called from invalid context splat in\nbucket_table_a…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()\n\nsyzbot reported a sleeping function called from invalid context splat in\nbucket_table_a…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 < bcb3d0c867ee40dc48e9c085bf328fbc679b6656","Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 < 0ceda28f371df9e0bbdaa29214f71fe8298f23d8","Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 < 2943f1f4b7f2816177060eb9f551f2e6d8b629ba","Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 < 540e583b66d6402bf556fde5e53c817a54c1afe5","Linux 6.9"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:22.557","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89986","references":[{"url":"https://git.kernel.org/stable/c/0ceda28f371df9e0bbdaa29214f71fe8298f23d8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2943f1f4b7f2816177060eb9f551f2e6d8b629ba","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/540e583b66d6402bf556fde5e53c817a54c1afe5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bcb3d0c867ee40dc48e9c085bf328fbc679b6656","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.951Z","epss":0.00163,"epssPercentile":0.05937,"slug":"CVE-2026-89986","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()\n\nsyzbot reported a sleeping function called from invalid context splat in\nbucket_table_alloc().\n\nWhen rhashtable_insert_slow() rehashes the table under rcu_read_lock(), it\ncalls bucket_table_alloc(..., GFP_ATOMIC | __GFP_NOWARN).  If the bucket\ntable allocation uses vmalloc, __vmalloc_node_range_noprof() invokes\nvm_area_alloc_pages() -> alloc_pages_bulk_mempolicy_noprof() with the\npassed GFP_ATOMIC flags.\n\nIf the current task has an MPOL_WEIGHTED_INTERLEAVE mempolicy,\nalloc_pages_bulk_weighted_interleave() is called and currently hardcodes\nGFP_KERNEL when allocating the temporary weights array, triggering a\nmight_alloc() splat in atomic/RCU contexts.\n\nPass the gfp flags (masked with GFP_RECLAIM_MASK to strip page-allocator\nzone modifiers like __GFP_HIGHMEM) received by\nalloc_pages_bulk_weighted_interleave() to kmalloc() instead of hardcoding\nGFP_KERNEL.  Since the weights buffer is immediately initialized in full,\nkmalloc() is sufficient.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205057,"id":"CVE-2026-89986","ts":1789570704984,"field":"cvss","old":null,"new":"7.8"},{"seq":205056,"id":"CVE-2026-89986","ts":1789570704984,"field":"severity","old":"none","new":"high"}]}