---
id: CVE-2019-12904
title: >-
  In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a
  flush-and-reload side-channel attack because physical addresses are available
  to other processes
summary: >-
  In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a
  flush-and-reload side-channel attack because physical addresses are available
  to other processes. (The C implementation is used on platforms where an
  assembly-language im…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-668
vendor: gnupg
product: libgcrypt
affected:
  - libgcrypt = 1.8.4
  - leap = 15.0
published: '2019-06-20'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T07:16:45.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-12904'
references:
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00049.html'
    label: cve@mitre.org
  - url: 'https://dev.gnupg.org/T4541'
    label: cve@mitre.org
  - url: >-
      https://github.com/gpg/libgcrypt/commit/a4c561aab1014c3630bc88faf6f5246fee16b020
    label: cve@mitre.org
  - url: >-
      https://github.com/gpg/libgcrypt/commit/daedbbb5541cd8ecda1459d3b843ea4d92788762
    label: cve@mitre.org
  - url: >-
      https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    label: cve@mitre.org
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00049.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://dev.gnupg.org/T4541'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/gpg/libgcrypt/commit/a4c561aab1014c3630bc88faf6f5246fee16b020
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/gpg/libgcrypt/commit/daedbbb5541cd8ecda1459d3b843ea4d92788762
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.02063
epssPercentile: 0.80868
ingestedAt: '2026-10-14T07:21:04.815Z'
---

## Overview

In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a flush-and-reload side-channel attack because physical addresses are available to other processes. (The C implementation is used on platforms where an assembly-language implementation is unavailable.) NOTE: the vendor's position is that the issue report cannot be validated because there is no description of an attack

## Affected

- `libgcrypt = 1.8.4`
- `leap = 15.0`

## Remediation

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