CVE-2026-89986
HighCVSS 7.8Summary
In the Linux kernel, alloc_pages_bulk_weighted_interleave() hardcodes GFP_KERNEL when allocating the temporary weights array, even when called in atomic/RCU context. This can trigger a might_alloc() splat due to a sleeping allocation in an invalid context.
Risk Assessment
This can cause system instability, kernel warnings, or potential hangs. However, it requires a specific memory policy configuration and atomic context call.
Recommendation
Update the Linux kernel to a version containing the fix that passes the appropriate GFP flags to kmalloc() instead of hardcoding GFP_KERNEL.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS