{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53343",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53343"
  ],
  "published": "2026-07-01T13:34:53Z",
  "summary": "ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow\n\nCommit 44e9a3bb76e5 (\"ARM: 9430/1: entry: Do a dummy read from\nVMAP shadow\") added a dummy read from the KASAN VMAP stack shadow in\n__switch_to(). The read uses ldr, but the KASAN shadow address is\nbyte-granular and is not guaranteed to be word aligned.\n\nARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and\nCONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to()\nwith an alignment exception before reaching init.\n\nUse ldrb for the dummy shadow access. The code only needs to fault in the\nshadow mapping if the stack shadow is missing, so a byte load is sufficient\nand matches the granularity of KASAN shadow memory.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53343"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-01T13:34:53Z"
  }
}