CVE-2026-53047 (GCVE-0-2026-53047)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
efi/capsule-loader: fix incorrect sizeof in phys array reallocation
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < 22022cd8851703a58f67615a17bc7e9e8682785b (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < 67adde6bfdfd563a54b045d59aeb9a2d90c80697 (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < 608e1f7bc9d171ab26c1fba288c97fc76363c27d (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < 8be69e9245f805566bac68ffc8574b64735fd996 (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < 5e185330d902b12fe8e6eb4b8514b5d736d8d66d (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < e0e6b14995fd6fa2c0df8c712d76ab32f0694c31 (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < ab3f7098a3a27175b91cfc947950f5c26855801b (git)
Affected: f24c4d478013d82bd1b943df566fff3561d52864 , < 48a428215782321b56956974f23593e40ce84b7a (git)
Affected: 95a362c9a6892085f714eb6e31eea6a0e3aa93bf (git)
Affected: 4.14.13 , < 4.15 (semver)
Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T17:36:01+00:00",
      "cve": "CVE-2026-53047",
      "id": "CVE-2026-53047",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: efi/capsule-loader: fix incorrect sizeof in phys array reallocation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53047.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:51:39Z",
      "cve": "CVE-2026-53047",
      "id": "CVE-2026-53047",
      "initial_release_date": "2026-07-01T03:19:37Z",
      "product_status:known_affected": "144",
      "product_status:known_not_affected": "92",
      "product_status:recommended": "98",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53047",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53047.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.