arm64: io: Extract user memory type in ioremap_prot()

{
  "id": "6c9494be9a8e2ac5ed659d0bb641a3a9f14cd937ffdb963f810cd6009a97ed93",
  "url": "https://osv.dev/vulnerability/CVE-2026-23346",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "arm64: io: Extract user memory type in ioremap_prot()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: arm64: io: Extract user memory type in ioremap_prot() The only caller of ioremap_prot() outside of the generic ioremap() implementation is generic_access_phys(), which passes a 'pgprot_t' value determined from the user mapping of the target 'pfn' being accessed by the kernel. On arm64, the 'pgprot_t' contains all of the non-address bits from the pte, including the permission controls, and so we end up returning a new user mapping from ioremap_prot() which faults when accessed from the kernel on systems with PAN: | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000 | ... | Call trace: | __memcpy_fromio+0x80/0xf8 | generic_access_phys+0x20c/0x2b8 | __access_remote_vm+0x46c/0x5b8 | access_remote_vm+0x18/0x30 | environ_read+0x238/0x3e8 | vfs_read+0xe4/0x2b0 | ksys_read+0xcc/0x178 | __arm64_sys_read+0x4c/0x68 Extract only the memory type from the user 'pgprot_t' in ioremap_prot() and assert that we're being passed a user mapping, to protect us against any changes in future that may require additional handling. To avoid falsely flagging users of ioremap(), provide our own ioremap() macro which simply wraps __ioremap_prot().",
    "evidence": "osv:CVE-2026-23346",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23346",
      "aliases": [
        "CVE-2026-23346"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "893dea9ccd08dab924839354aba21d4ed7a9abc0"
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                {
                  "fixed": "64858b76ec67c5fc40fef8ec1841fecb78c1ebde"
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                {
                  "fixed": "eeecafce5afffb4da703666ebefbd4d6e2a5abf6"
                },
                {
                  "fixed": "3d64dcc0799c2d6921ba027716b7be721eb19fa8"
                },
                {
                  "fixed": "d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a"
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                {
                  "fixed": "8f098037139b294050053123ab2bc0f819d08932"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23346.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
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                {
                  "fixed": "6.6.143"
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            {
              "type": "ECOSYSTEM",
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                {
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.17"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.7"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23346.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.810152230Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8",
        "https://git.kernel.org/stable/c/64858b76ec67c5fc40fef8ec1841fecb78c1ebde",
        "https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932",
        "https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a",
        "https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23346.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23346",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23346.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23346",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497457,
  "published_at": "2026-03-25T10:27:33.133+00:00"
}