{
  "cveId": "CVE-2026-64149",
  "url": "https://patchblox.com/security/cve/CVE-2026-64149",
  "summary": "CVE-2026-64149 is fixed in 20 products on 1 platform, first by ALAS2023-2026-1881, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  dma-mapping: move dma_map_resource() sanity chec...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  dma-mapping: move dma_map_resource() sanity check into debug code  dma_map_resource() uses pfn_valid() to ensure the range is not RAM. However, pfn_valid() only checks for availability of the memory map for a PFN but it does not ensure that the PFN is actually backed by RAM. On ARM64 with SPARSEMEM (128MB section granularity), MMIO addresses that share a section with RAM will falsely trigger the WARN_ON_ONCE and cause dma_map_resource() to return DMA_MAPPING_ERROR.  This causes a WARNING on Raspberry Pi 4 during spi_bcm2835 probe because the SPI FIFO register (0xfe204004) falls in the same sparsemem section as the end of RAM (0xf8000000-0xfbffffff), both in section 31 (0xf8000000-0xffffffff).  Move the sanity check from dma_map_resource() into debug_dma_map_phys() and replace the unreliable pfn_valid() with pfn_valid() \u0026\u0026 !PageReserved(), which correctly identifies actual usable RAM without false positives for MMIO regions that happen to have struct pages.  Since dma_map_resource() is dma_map_phys(DMA_ATTR_MMIO), the check applies equally to both APIs. Any non-reserved page represents kernel memory to a sufficient degree that using DMA_ATTR_MMIO on it is almost certainly wrong and risks breaking coherency on non-coherent platforms. ZONE_DEVICE pages used for PCI P2P DMA (MEMORY_DEVICE_PCI_P2PDMA) have PageReserved set, so they will not trigger a false positive.  The check no longer blocks the mapping and uses err_printk() to integrate with dma-debug filtering.",
  "published": "2026-06-22T09:00:00Z",
  "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": 0.0016,
  "epssPercentile": 0.05199,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.35-68.127",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.12-1",
      "fix": "DEBIAN-CVE-2026-64149",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64149",
      "released": "2026-07-20T12:58:36Z"
    },
    {
      "platform": "linux",
      "product": "microvm-kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
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      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
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      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "1:6.18.35-68.127.amzn2023",
      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}