FKIE_CVE-2026-53343

Vulnerability from fkie_nvd - Published: 2026-07-01 14:16 - Updated: 2026-07-01 14:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in __switch_to(). The read uses ldr, but the KASAN shadow address is byte-granular and is not guaranteed to be word aligned. ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to() with an alignment exception before reaching init. Use ldrb for the dummy shadow access. The code only needs to fault in the shadow mapping if the stack shadow is missing, so a byte load is sufficient and matches the granularity of KASAN shadow memory.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm/kernel/entry-armv.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c0b8c148a7754826156993ed6442d31536ec86b4",
              "status": "affected",
              "version": "8fe148d39c127de3fb78dfa6da95a3608dfda454",
              "versionType": "git"
            },
            {
              "lessThan": "c2e3aadc8fef7da068490597fc5582f8f362aeb2",
              "status": "affected",
              "version": "ef21187c0672a2b2cbec44f33bab9ec47d5c277c",
              "versionType": "git"
            },
            {
              "lessThan": "c74990828d3c486ee44aaa68240eb3abff289d1c",
              "status": "affected",
              "version": "c86d26b4b089ca294b3b7d915a7da61edb77935f",
              "versionType": "git"
            },
            {
              "lessThan": "517720913bd3c17a52cd55a740064f68455ab88e",
              "status": "affected",
              "version": "44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2",
              "versionType": "git"
            },
            {
              "lessThan": "2a4dc9a0ac3326e79fb58fdaae724b92127709a9",
              "status": "affected",
              "version": "44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2",
              "versionType": "git"
            },
            {
              "lessThan": "77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6",
              "status": "affected",
              "version": "44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.176",
              "status": "affected",
              "version": "6.1.120",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.143",
              "status": "affected",
              "version": "6.6.64",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.94",
              "status": "affected",
              "version": "6.12.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm/kernel/entry-armv.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-53343",
  "lastModified": "2026-07-01T14:16:42.363",
  "metrics": {},
  "published": "2026-07-01T14:16:42.363",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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