{
  "cveId": "CVE-2026-98923",
  "url": "https://patchblox.com/security/cve/CVE-2026-98923",
  "summary": "CVE-2026-98923 is fixed in 38 products on 1 platform, first by DEBIAN-CVE-2026-98923, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  arm64: io: Reject non-user protection in ioremap...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  arm64: io: Reject non-user protection in ioremap_prot()  Mapping a stack-top page via /dev/mem with PROT_NONE and then reading that process\u0027s /proc/\u003Cpid\u003E/cmdline triggers a spurious WARN in ioremap_prot() through generic_access_phys():    WARNING: ./arch/arm64/include/asm/io.h:275 at generic_access_phys   Call trace:     generic_access_phys\u002B0x1c8/0x228 (P)     __access_remote_vm\u002B0x2b4/0x398     access_remote_vm\u002B0x14/0x30     get_mm_cmdline\u002B0xf8/0x2a0     proc_pid_cmdline_read\u002B0x68/0x120  generic_access_phys() passes the protection derived from the user PTE to ioremap_prot(). On arm64, a PROT_NONE mapping is represented by a present-invalid PTE, so pte_present() still returns true and the protection reaches ioremap_prot().  A PROT_NONE mapping does not have PTE_USER, causing the existing WARN_ON_ONCE() in ioremap_prot() to fire even though this is a valid user mapping. Execute-only mappings have the same issue and must not be readable through this path either.  ioremap_prot() should therefore reject protection values without PTE_USER without warning. This makes the access fail cleanly for PROT_NONE and execute-only mappings while retaining the existing user-protection contract.",
  "published": "2026-10-23T13:17:12Z",
  "severity": "important",
  "epss": 0.00168,
  "epssPercentile": 0.06182,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}