CVE-2026-89986

CVE CVE-2026-89986EUVD EUVD-2026-80594Published 2026-09-16T10:33:01.000ZLast changed 2026-09-16T14:41:02.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave() syzbot reported a sleeping function called from invalid context splat in bucket_table_alloc(). When rhashtable_insert_slow() rehashes the table under rcu_read_lock(), it calls bucket_table_alloc(..., GFP_ATOMIC | __GFP_NOWARN). If the bucket table allocation uses vmalloc, __vmalloc_node_range_noprof() invokes vm_area_alloc_pages() -> alloc_pages_bulk_mempolicy_noprof() with the passed GFP_ATOMIC flags. If the current task has an MPOL_WEIGHTED_INTERLEAVE mempolicy, alloc_pages_bulk_weighted_interleave() is called and currently hardcodes GFP_KERNEL when allocating the temporary weights array, triggering a might_alloc() splat in atomic/RCU contexts. Pass the gfp flags (masked with GFP_RECLAIM_MASK to strip page-allocator zone modifiers like __GFP_HIGHMEM) received by alloc_pages_bulk_weighted_interleave() to kmalloc() instead of hardcoding GFP_KERNEL. Since the weights buffer is immediately initialized in full, kmalloc() is sufficient.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; patch: 6.12.110; fa3bea4e1f8202d787709b7e3654eb0a99aed758 <0ceda28f371df9e0bbdaa29214f71fe8298f23d8; 6.9; fa3bea4e1f8202d787709b7e3654eb0a99aed758 <bcb3d0c867ee40dc48e9c085bf328fbc679b6656; patch: 6.18.51; patch: 7.3-rc2; fa3bea4e1f8202d787709b7e3654eb0a99aed758 <2943f1f4b7f2816177060eb9f551f2e6d8b629ba; fa3bea4e1f8202d787709b7e3654eb0a99aed758 <540e583b66d6402bf556fde5e53c817a54c1afe5; patch: 7.2.5

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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