{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98923",
  "modified": "2026-10-24T04:30:01Z",
  "upstream": [
    "CVE-2026-98923"
  ],
  "published": "2026-10-23T12:06:24Z",
  "summary": "arm64: io: Reject non-user protection in ioremap_prot()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: io: Reject non-user protection in ioremap_prot()\n\nMapping a stack-top page via /dev/mem with PROT_NONE and then\nreading that process's /proc/<pid>/cmdline triggers a spurious WARN\nin ioremap_prot() through generic_access_phys():\n\n  WARNING: ./arch/arm64/include/asm/io.h:275 at generic_access_phys\n  Call trace:\n    generic_access_phys+0x1c8/0x228 (P)\n    __access_remote_vm+0x2b4/0x398\n    access_remote_vm+0x14/0x30\n    get_mm_cmdline+0xf8/0x2a0\n    proc_pid_cmdline_read+0x68/0x120\n\ngeneric_access_phys() passes the protection derived from the user PTE\nto ioremap_prot(). On arm64, a PROT_NONE mapping is represented by a\npresent-invalid PTE, so pte_present() still returns true and the\nprotection reaches ioremap_prot().\n\nA PROT_NONE mapping does not have PTE_USER, causing the existing\nWARN_ON_ONCE() in ioremap_prot() to fire even though this is a valid\nuser mapping. Execute-only mappings have the same issue and must not\nbe readable through this path either.\n\nioremap_prot() should therefore reject protection values without\nPTE_USER without warning. This makes the access fail cleanly for\nPROT_NONE and execute-only mappings while retaining the existing\nuser-protection contract.",
  "affected": [
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      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.12.93-1+rpt1",
        "1:6.12.96-1+rpt1",
        "1:6.12.109-1+rpt1"
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            "binary_name": "linux-image-6.12.93+rpt-rpi-2712",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.93+rpt-rpi-v8",
            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
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            "binary_version": "1:6.12.93-1+rpt1"
          },
          {
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            "binary_version": "1:6.12.96-1+rpt1"
          },
          {
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            "binary_version": "1:6.12.96-1+rpt1"
          },
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            "binary_version": "1:6.12.96-1+rpt1"
          },
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            "binary_name": "linux-image-6.12.109+rpt-rpi-2712",
            "binary_version": "1:6.12.109-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.12.109+rpt-rpi-v8",
            "binary_version": "1:6.12.109-1+rpt1"
          },
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      "database_specific": {
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.112"
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            "upstream_version": "6.12.96",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.112"
          },
          "1:6.12.109-1+rpt1": {
            "linux_commit": "7d1826930811232688a50c99c540fbb137aed081",
            "upstream_version": "6.12.109",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.112"
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    },
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        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
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        "1:6.18.29-1+rpt1",
        "1:6.18.33-1+rpt1",
        "1:6.18.34-1+rpt1",
        "1:6.18.39-1+rpt1",
        "1:6.18.50-1+rpt1"
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      "ecosystem_specific": {
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            "binary_version": "1:6.18.29-1+rpt1"
          },
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            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v8-rt",
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            "binary_version": "1:6.18.50-1+rpt1"
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.55"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98923"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-23T12:06:24Z"
  }
}