{
  "cveId": "CVE-2021-47623",
  "url": "https://patchblox.com/security/cve/CVE-2021-47623",
  "summary": "CVE-2021-47623 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47623, released July 16, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc/fixmap: Fix VM debug warning on unmap  U...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  powerpc/fixmap: Fix VM debug warning on unmap  Unmapping a fixmap entry is done by calling __set_fixmap() with FIXMAP_PAGE_CLEAR as flags.  Today, powerpc __set_fixmap() calls map_kernel_page().  map_kernel_page() is not happy when called a second time for the same page.  \tWARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at\u002B0xc/0x1e8 \tCPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682 \tNIP:  c0017cd4 LR: c00187f0 CTR: 00000010 \tREGS: e1011d50 TRAP: 0700   Not tainted  (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty) \tMSR:  00029032 \u003CEE,ME,IR,DR,RI\u003E  CR: 42000208  XER: 00000000  \tGPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c \tGPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000 \tGPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 \tGPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000 \tNIP [c0017cd4] set_pte_at\u002B0xc/0x1e8 \tLR [c00187f0] map_kernel_page\u002B0x9c/0x100 \tCall Trace: \t[e1011e10] [c0736c68] vsnprintf\u002B0x358/0x6c8 (unreliable) \t[e1011e30] [c0165fec] __set_fixmap\u002B0x30/0x44 \t[e1011e40] [c0c13bdc] early_iounmap\u002B0x11c/0x170 \t[e1011e70] [c0c06cb0] ioremap_legacy_serial_console\u002B0x88/0xc0 \t[e1011e90] [c0c03634] do_one_initcall\u002B0x80/0x178 \t[e1011ef0] [c0c0385c] kernel_init_freeable\u002B0xb4/0x250 \t[e1011f20] [c0007e34] kernel_init\u002B0x24/0x140 \t[e1011f30] [c0016268] ret_from_kernel_thread\u002B0x5c/0x64 \tInstruction dump: \t7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010 \t4e800020 81250000 712a0001 41820008 \u003C0fe00000\u003E 9421ffe0 93e1001c 48000030  Implement unmap_kernel_page() which clears an existing pte.",
  "published": "2024-07-16T12:15:02Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00225,
  "epssPercentile": 0.13249,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.16.10-1",
      "fix": "DEBIAN-CVE-2021-47623",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47623",
      "released": "2024-07-16T12:15:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.16.10-1",
      "fix": "DEBIAN-CVE-2021-47623",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47623",
      "released": "2024-07-16T12:15:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.16.10-1",
      "fix": "DEBIAN-CVE-2021-47623",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47623",
      "released": "2024-07-16T12:15:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}