{
  "cveId": "CVE-2026-23346",
  "url": "https://patchblox.com/security/cve/CVE-2026-23346",
  "summary": "CVE-2026-23346 is fixed in 33 products on 1 platform, first by DEBIAN-CVE-2026-23346, released March 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "arm64: io: Extract user memory type in ioremap_prot()",
  "description": "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 \u0027pgprot_t\u0027 value determined from the user mapping of the target \u0027pfn\u0027 being accessed by the kernel. On arm64, the \u0027pgprot_t\u0027 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\u002B0x80/0xf8   |   generic_access_phys\u002B0x20c/0x2b8   |   __access_remote_vm\u002B0x46c/0x5b8   |   access_remote_vm\u002B0x18/0x30   |   environ_read\u002B0x238/0x3e8   |   vfs_read\u002B0xe4/0x2b0   |   ksys_read\u002B0xcc/0x178   |   __arm64_sys_read\u002B0x4c/0x68  Extract only the memory type from the user \u0027pgprot_t\u0027 in ioremap_prot() and assert that we\u0027re 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().",
  "published": "2026-03-25T11:16:32Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00132,
  "epssPercentile": 0.02817,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23346",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}