CVE-2026-53047

Local denial of service via undersized address array

Published Jun 24, 2026 · Updated Jun 24, 2026

Heap buffer overflow in the Linux Kernel EFI capsule loader allows local users to interrupt affected 32-bit PAE systems. __efi_capsule_setup_info() reallocates cap_info->phys using pointer size instead of phys_addr_t size, then efi_capsule_write() stores 64-bit physical addresses into the undersized array. Reachability requires a 32-bit PAE kernel and local access to the EFI capsule-loader interface; 64-bit systems are not affected by this size mismatch.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in the Linux Kernel EFI capsule loader allows local users to interrupt affected 32-bit PAE systems. __efi_capsule_setup_info() reallocates cap_info->phys using pointer size instead of phys_addr_t size, then efi_capsule_write() stores 64-bit physical addresses into the undersized array. Reachability requires a 32-bit PAE kernel and local access to the EFI capsule-loader interface; 64-bit systems are not affected by this size mismatch.

The record

CVE
CVE-2026-53047
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-131, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14.13 <4.15
  2. Affected versionversion=4.15
  3. Affected versionversion=95a362c9a6892085f714eb6e31eea6a0e3aa93bf
  4. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <22022cd8851703a58f67615a17bc7e9e8682785b
  5. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <48a428215782321b56956974f23593e40ce84b7a
  6. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <5e185330d902b12fe8e6eb4b8514b5d736d8d66d
  7. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <608e1f7bc9d171ab26c1fba288c97fc76363c27d
  8. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <67adde6bfdfd563a54b045d59aeb9a2d90c80697
  9. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <8be69e9245f805566bac68ffc8574b64735fd996
  10. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <ab3f7098a3a27175b91cfc947950f5c26855801b
  11. Affected versionversion=f24c4d478013d82bd1b943df566fff3561d52864 <e0e6b14995fd6fa2c0df8c712d76ab32f0694c31

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.14.13 <4.15; version=4.15; version=95a362c9a6892085f714eb6e31eea6a0e3aa93bf; version=f24c4d478013d82bd1b943df566fff3561d52864 <22022cd8851703a58f67615a17bc7e9e8682785b; version=f24c4d478013d82bd1b943df566fff3561d52864 <48a428215782321b56956974f23593e40ce84b7a; version=f24c4d478013d82bd1b943df566fff3561d52864 <5e185330d902b12fe8e6eb4b8514b5d736d8d66d; version=f24c4d478013d82bd1b943df566fff3561d52864 <608e1f7bc9d171ab26c1fba288c97fc76363c27d; version=f24c4d478013d82bd1b943df566fff3561d52864 <67adde6bfdfd563a54b045d59aeb9a2d90c80697; version=f24c4d478013d82bd1b943df566fff3561d52864 <8be69e9245f805566bac68ffc8574b64735fd996; version=f24c4d478013d82bd1b943df566fff3561d52864 <ab3f7098a3a27175b91cfc947950f5c26855801b; version=f24c4d478013d82bd1b943df566fff3561d52864 <e0e6b14995fd6fa2c0df8c712d76ab32f0694c31

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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