{
  "cveId": "CVE-2026-31456",
  "url": "https://patchblox.com/security/cve/CVE-2026-31456",
  "summary": "CVE-2026-31456 is fixed in 73 products on 1 platform, first by DEBIAN-CVE-2026-31456, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/pagewalk: fix race between concurrent split a...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/pagewalk: fix race between concurrent split and refault  The splitting of a PUD entry in walk_pud_range() can race with a concurrent thread refaulting the PUD leaf entry causing it to try walking a PMD range that has disappeared.  An example and reproduction of this is to try reading numa_maps of a process while VFIO-PCI is setting up DMA (specifically the vfio_pin_pages_remote call) on a large BAR for that process.  This will trigger a kernel BUG: vfio-pci 0000:03:00.0: enabling device (0000 -\u003E 0002) BUG: unable to handle page fault for address: ffffa23980000000 PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI ... RIP: 0010:walk_pgd_range\u002B0x3b5/0x7a0 Code: 8d 43 ff 48 89 44 24 28 4d 89 ce 4d 8d a7 00 00 20 00 48 8b 4c 24 28 49 81 e4 00 00 e0 ff 49 8d 44 24 ff 48 39 c8 4c 0f 43 e3 \u003C49\u003E f7 06    9f ff ff ff 75 3b 48 8b 44 24 20 48 8b 40 28 48 85 c0 74 RSP: 0018:ffffac23e1ecf808 EFLAGS: 00010287 RAX: 00007f44c01fffff RBX: 00007f4500000000 RCX: 00007f44ffffffff RDX: 0000000000000000 RSI: 000ffffffffff000 RDI: ffffffff93378fe0 RBP: ffffac23e1ecf918 R08: 0000000000000004 R09: ffffa23980000000 R10: 0000000000000020 R11: 0000000000000004 R12: 00007f44c0200000 R13: 00007f44c0000000 R14: ffffa23980000000 R15: 00007f44c0000000 FS:  00007fe884739580(0000) GS:ffff9b7d7a9c0000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffa23980000000 CR3: 000000c0650e2005 CR4: 0000000000770ef0 PKRU: 55555554 Call Trace:  \u003CTASK\u003E  __walk_page_range\u002B0x195/0x1b0  walk_page_vma\u002B0x62/0xc0  show_numa_map\u002B0x12b/0x3b0  seq_read_iter\u002B0x297/0x440  seq_read\u002B0x11d/0x140  vfs_read\u002B0xc2/0x340  ksys_read\u002B0x5f/0xe0  do_syscall_64\u002B0x68/0x130  ? get_page_from_freelist\u002B0x5c2/0x17e0  ? mas_store_prealloc\u002B0x17e/0x360  ? vma_set_page_prot\u002B0x4c/0xa0  ? __alloc_pages_noprof\u002B0x14e/0x2d0  ? __mod_memcg_lruvec_state\u002B0x8d/0x140  ? __lruvec_stat_mod_folio\u002B0x76/0xb0  ? __folio_mod_stat\u002B0x26/0x80  ? do_anonymous_page\u002B0x705/0x900  ? __handle_mm_fault\u002B0xa8d/0x1000  ? __count_memcg_events\u002B0x53/0xf0  ? handle_mm_fault\u002B0xa5/0x360  ? do_user_addr_fault\u002B0x342/0x640  ? arch_exit_to_user_mode_prepare.constprop.0\u002B0x16/0xa0  ? irqentry_exit_to_user_mode\u002B0x24/0x100  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e RIP: 0033:0x7fe88464f47e Code: c0 e9 b6 fe ff ff 50 48 8d 3d be 07 0b 00 e8 69 01 02 00 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 0f 05 \u003C48\u003E 3d 00    f0 ff ff 77 5a c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 28 RSP: 002b:00007ffe6cd9a9b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007fe88464f47e RDX: 0000000000020000 RSI: 00007fe884543000 RDI: 0000000000000003 RBP: 00007fe884543000 R08: 00007fe884542010 R09: 0000000000000000 R10: fffffffffffffbc5 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000  \u003C/TASK\u003E  Fix this by validating the PUD entry in walk_pmd_range() using a stable snapshot (pudp_get()).  If the PUD is not present or is a leaf, retry the walk via ACTION_AGAIN instead of descending further.  This mirrors the retry logic in walk_pte_range(), which lets walk_pmd_range() retry if the PTE is not being got by pte_offset_map_lock().",
  "published": "2026-04-22T14:16:40Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00089,
  "epssPercentile": 0.00392,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "fix": "ALAS2023-2026-1746",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746",
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      "released": "2026-06-08T09:00:00Z"
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746",
      "released": "2026-05-25T09:00:00Z"
    }
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}