---
id: CVE-2026-53047
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 *) ins…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    22022cd8851703a58f67615a17bc7e9e8682785b
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    67adde6bfdfd563a54b045d59aeb9a2d90c80697
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    608e1f7bc9d171ab26c1fba288c97fc76363c27d
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    8be69e9245f805566bac68ffc8574b64735fd996
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    5e185330d902b12fe8e6eb4b8514b5d736d8d66d
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    e0e6b14995fd6fa2c0df8c712d76ab32f0694c31
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    ab3f7098a3a27175b91cfc947950f5c26855801b
  - >-
    Linux >= f24c4d478013d82bd1b943df566fff3561d52864 <
    48a428215782321b56956974f23593e40ce84b7a
  - Linux 95a362c9a6892085f714eb6e31eea6a0e3aa93bf
  - Linux >= 4.14.13 < 4.15
  - Linux 4.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:17:08.543367Z'
published: '2026-06-24'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:23:56.769Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53047'
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'
tags:
  - cve.org
epss: 0.00176
epssPercentile: 0.07092
ingestedAt: '2026-11-06T16:57:43.303Z'
---

## Overview

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.

## Affected

- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 22022cd8851703a58f67615a17bc7e9e8682785b`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 67adde6bfdfd563a54b045d59aeb9a2d90c80697`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 608e1f7bc9d171ab26c1fba288c97fc76363c27d`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 8be69e9245f805566bac68ffc8574b64735fd996`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 5e185330d902b12fe8e6eb4b8514b5d736d8d66d`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < e0e6b14995fd6fa2c0df8c712d76ab32f0694c31`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < ab3f7098a3a27175b91cfc947950f5c26855801b`
- `Linux >= f24c4d478013d82bd1b943df566fff3561d52864 < 48a428215782321b56956974f23593e40ce84b7a`
- `Linux 95a362c9a6892085f714eb6e31eea6a0e3aa93bf`
- `Linux >= 4.14.13 < 4.15`
- `Linux 4.15`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.