{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89986",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89986"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "mm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()",
  "details": "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_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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89986"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bcb3d0c867ee40dc48e9c085bf328fbc679b6656"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0ceda28f371df9e0bbdaa29214f71fe8298f23d8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2943f1f4b7f2816177060eb9f551f2e6d8b629ba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/540e583b66d6402bf556fde5e53c817a54c1afe5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Triggering requires set_mempolicy(MPOL_WEIGHTED_INTERLEAVE) on the attacker's task and a local syscall that grows an rhashtable until GFP_ATOMIC kvmalloc falls back to vmalloc (nftables hash sets, tc flower, BPF rhashtable maps); softirq/packet paths use default_policy via in_interrupt() and cannot apply the attacker's mempolicy.\nAC:L - The attacker fully controls setup: set_mempolicy on their own task, insert enough rhashtable elements for a >PAGE_SIZE bucket table, and apply memory pressure so GFP_ATOMIC kmalloc fails and kvmalloc uses vmalloc; CONFIG_NUMA is standard on x86_64/arm64 distro and cloud kernels, and no attacker-uncontrollable race is required.\nPR:L - set_mempolicy() has no capability check, and the rhashtable rehash path is reachable by an unprivileged user via nftables or tc in a user+net namespace where CAP_NET_ADMIN is namespace-local; init-namespace root is not required.\nUI:N - The attacker sets their own mempolicy and drives the rhashtable inserts themselves; no victim action such as mounting a filesystem or opening a file is required.\nS:U - The illegal GFP_KERNEL allocation and any resulting RCU use-after-free of the rhashtable bucket table stay inside the host kernel's memory-management authority; this is standard in-kernel impact, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - Sleeping under rcu_read_lock() in rhashtable_insert_slow() on non-PREEMPT_RCU kernels can let the grace period complete and free the old bucket table before rhashtable_rehash_attach() uses it, yielding a use-after-free read of kernel heap.\nI:H - The same RCU-break UAF lets rhashtable_rehash_attach() cmpxchg old_tbl->future_tbl on a freed table, which is an attacker-sprayable kernel write primitive via heap reuse rather than a clean failure.\nA:H - GFP_KERNEL under rcu_read_lock produces a sleeping-from-invalid-context BUG/WARN (panic with panic_on_warn), can RCU-stall or deadlock if reclaim actually sleeps, and the bucket-table UAF can oops the kernel."
    }
  }
}