{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-40915",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-40915"
  ],
  "published": "2024-07-12T12:27:31Z",
  "summary": "riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: rewrite __kernel_map_pages() to fix sleeping in invalid context\n\n__kernel_map_pages() is a debug function which clears the valid bit in page\ntable entry for deallocated pages to detect illegal memory accesses to\nfreed pages.\n\nThis function set/clear the valid bit using __set_memory(). __set_memory()\nacquires init_mm's semaphore, and this operation may sleep. This is\nproblematic, because  __kernel_map_pages() can be called in atomic context,\nand thus is illegal to sleep. An example warning that this causes:\n\nBUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1578\nin_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, name: kthreadd\npreempt_count: 2, expected: 0\nCPU: 0 PID: 2 Comm: kthreadd Not tainted 6.9.0-g1d4c6d784ef6 #37\nHardware name: riscv-virtio,qemu (DT)\nCall Trace:\n[<ffffffff800060dc>] dump_backtrace+0x1c/0x24\n[<ffffffff8091ef6e>] show_stack+0x2c/0x38\n[<ffffffff8092baf8>] dump_stack_lvl+0x5a/0x72\n[<ffffffff8092bb24>] dump_stack+0x14/0x1c\n[<ffffffff8003b7ac>] __might_resched+0x104/0x10e\n[<ffffffff8003b7f4>] __might_sleep+0x3e/0x62\n[<ffffffff8093276a>] down_write+0x20/0x72\n[<ffffffff8000cf00>] __set_memory+0x82/0x2fa\n[<ffffffff8000d324>] __kernel_map_pages+0x5a/0xd4\n[<ffffffff80196cca>] __alloc_pages_bulk+0x3b2/0x43a\n[<ffffffff8018ee82>] __vmalloc_node_range+0x196/0x6ba\n[<ffffffff80011904>] copy_process+0x72c/0x17ec\n[<ffffffff80012ab4>] kernel_clone+0x60/0x2fe\n[<ffffffff80012f62>] kernel_thread+0x82/0xa0\n[<ffffffff8003552c>] kthreadd+0x14a/0x1be\n[<ffffffff809357de>] ret_from_fork+0xe/0x1c\n\nRewrite this function with apply_to_existing_page_range(). It is fine to\nnot have any locking, because __kernel_map_pages() works with pages being\nallocated/deallocated and those pages are not changed by anyone else in the\nmeantime.",
  "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": "6.1.95",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-40915"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}