{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38029",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38029"
  ],
  "published": "2025-06-18T09:34:24Z",
  "summary": "kasan: avoid sleepable page allocation from atomic context",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkasan: avoid sleepable page allocation from atomic context\n\napply_to_pte_range() enters the lazy MMU mode and then invokes\nkasan_populate_vmalloc_pte() callback on each page table walk iteration. \nHowever, the callback can go into sleep when trying to allocate a single\npage, e.g.  if an architecutre disables preemption on lazy MMU mode enter.\n\nOn s390 if make arch_enter_lazy_mmu_mode() -> preempt_enable() and\narch_leave_lazy_mmu_mode() -> preempt_disable(), such crash occurs:\n\n[    0.663336] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:321\n[    0.663348] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, name: kthreadd\n[    0.663358] preempt_count: 1, expected: 0\n[    0.663366] RCU nest depth: 0, expected: 0\n[    0.663375] no locks held by kthreadd/2.\n[    0.663383] Preemption disabled at:\n[    0.663386] [<0002f3284cbb4eda>] apply_to_pte_range+0xfa/0x4a0\n[    0.663405] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.15.0-rc5-gcc-kasan-00043-gd76bb1ebb558-dirty #162 PREEMPT\n[    0.663408] Hardware name: IBM 3931 A01 701 (KVM/Linux)\n[    0.663409] Call Trace:\n[    0.663410]  [<0002f3284c385f58>] dump_stack_lvl+0xe8/0x140\n[    0.663413]  [<0002f3284c507b9e>] __might_resched+0x66e/0x700\n[    0.663415]  [<0002f3284cc4f6c0>] __alloc_frozen_pages_noprof+0x370/0x4b0\n[    0.663419]  [<0002f3284ccc73c0>] alloc_pages_mpol+0x1a0/0x4a0\n[    0.663421]  [<0002f3284ccc8518>] alloc_frozen_pages_noprof+0x88/0xc0\n[    0.663424]  [<0002f3284ccc8572>] alloc_pages_noprof+0x22/0x120\n[    0.663427]  [<0002f3284cc341ac>] get_free_pages_noprof+0x2c/0xc0\n[    0.663429]  [<0002f3284cceba70>] kasan_populate_vmalloc_pte+0x50/0x120\n[    0.663433]  [<0002f3284cbb4ef8>] apply_to_pte_range+0x118/0x4a0\n[    0.663435]  [<0002f3284cbc7c14>] apply_to_pmd_range+0x194/0x3e0\n[    0.663437]  [<0002f3284cbc99be>] __apply_to_page_range+0x2fe/0x7a0\n[    0.663440]  [<0002f3284cbc9e88>] apply_to_page_range+0x28/0x40\n[    0.663442]  [<0002f3284ccebf12>] kasan_populate_vmalloc+0x82/0xa0\n[    0.663445]  [<0002f3284cc1578c>] alloc_vmap_area+0x34c/0xc10\n[    0.663448]  [<0002f3284cc1c2a6>] __get_vm_area_node+0x186/0x2a0\n[    0.663451]  [<0002f3284cc1e696>] __vmalloc_node_range_noprof+0x116/0x310\n[    0.663454]  [<0002f3284cc1d950>] __vmalloc_node_noprof+0xd0/0x110\n[    0.663457]  [<0002f3284c454b88>] alloc_thread_stack_node+0xf8/0x330\n[    0.663460]  [<0002f3284c458d56>] dup_task_struct+0x66/0x4d0\n[    0.663463]  [<0002f3284c45be90>] copy_process+0x280/0x4b90\n[    0.663465]  [<0002f3284c460940>] kernel_clone+0xd0/0x4b0\n[    0.663467]  [<0002f3284c46115e>] kernel_thread+0xbe/0xe0\n[    0.663469]  [<0002f3284c4e440e>] kthreadd+0x50e/0x7f0\n[    0.663472]  [<0002f3284c38c04a>] __ret_from_fork+0x8a/0xf0\n[    0.663475]  [<0002f3284ed57ff2>] ret_from_fork+0xa/0x38\n\nInstead of allocating single pages per-PTE, bulk-allocate the shadow\nmemory prior to applying kasan_populate_vmalloc_pte() callback on a page\nrange.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38029"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6748dd09196248b985cca39eaf651d5317271977"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6ea95a34cbd014ab6ade4248107b86b0aaf2d6c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}