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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 CPE status
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)
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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)
guessed 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": "2026-08-31T16:46:18Z",
      "cve": "CVE-2026-53047",
      "id": "CVE-2026-53047",
      "initial_release_date": "2026-07-01T03:19:37Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "578",
      "product_status:known_not_affected": "152",
      "product_status:recommended": "250",
      "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": "7"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.