CVE-2026-53047 (GCVE-0-2026-53047)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-06-24 16:29
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: efi/capsule-loader: fix incorrect sizeof in phys array reallocation The krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses sizeof(phys_addr_t *) instead of sizeof(phys_addr_t), which might be causing an undersized allocation. The allocation is also inconsistent with the initial array allocation in efi_capsule_open() that allocates one entry with sizeof(phys_addr_t), and the efi_capsule_write() function that stores phys_addr_t values (not pointers) via page_to_phys(). On 64-bit systems where sizeof(phys_addr_t) == sizeof(phys_addr_t *), this goes unnoticed. On 32-bit systems with PAE where phys_addr_t is 64-bit but pointers are 32-bit, this allocates half the required space, which might lead to a heap buffer overflow when storing physical addresses. This is similar to the bug fixed in commit fccfa646ef36 ("efi/capsule-loader: fix incorrect allocation size") which fixed the same issue at the initial allocation site.
References
Impacted products
Vendor Product Version
Linux Linux Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: f24c4d478013d82bd1b943df566fff3561d52864
Version: 95a362c9a6892085f714eb6e31eea6a0e3aa93bf
Version: 4.14.13   ≤
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/capsule-loader.c"
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          "programFiles": [
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          "vendor": "Linux",
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            },
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              "status": "unaffected",
              "version": "6.1.175",
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      ],
      "cpeApplicability": [
        {
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi/capsule-loader: fix incorrect sizeof in phys array reallocation\n\nThe krealloc() call for cap_info-\u003ephys in __efi_capsule_setup_info() uses\nsizeof(phys_addr_t *) instead of sizeof(phys_addr_t), which might be\ncausing an undersized allocation.\n\nThe allocation is also inconsistent with the initial array allocation in\nefi_capsule_open() that allocates one entry with sizeof(phys_addr_t),\nand the efi_capsule_write() function that stores phys_addr_t values (not\npointers) via page_to_phys().\n\nOn 64-bit systems where sizeof(phys_addr_t) == sizeof(phys_addr_t *), this\ngoes unnoticed. On 32-bit systems with PAE where phys_addr_t is 64-bit but\npointers are 32-bit, this allocates half the required space, which might\nlead to a heap buffer overflow when storing physical addresses.\n\nThis is similar to the bug fixed in commit fccfa646ef36 (\"efi/capsule-loader:\nfix incorrect allocation size\") which fixed the same issue at the initial\nallocation site."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:53.491Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/22022cd8851703a58f67615a17bc7e9e8682785b"
        },
        {
          "url": "https://git.kernel.org/stable/c/67adde6bfdfd563a54b045d59aeb9a2d90c80697"
        },
        {
          "url": "https://git.kernel.org/stable/c/608e1f7bc9d171ab26c1fba288c97fc76363c27d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8be69e9245f805566bac68ffc8574b64735fd996"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e185330d902b12fe8e6eb4b8514b5d736d8d66d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0e6b14995fd6fa2c0df8c712d76ab32f0694c31"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab3f7098a3a27175b91cfc947950f5c26855801b"
        },
        {
          "url": "https://git.kernel.org/stable/c/48a428215782321b56956974f23593e40ce84b7a"
        }
      ],
      "title": "efi/capsule-loader: fix incorrect sizeof in phys array reallocation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53047",
    "datePublished": "2026-06-24T16:29:53.491Z",
    "dateReserved": "2026-06-09T07:44:35.381Z",
    "dateUpdated": "2026-06-24T16:29:53.491Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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