---
id: CVE-2019-18276
title: >-
  An issue was discovered in disable_priv_mode in shell.c in GNU Bash through
  5.0 patch 11
summary: >-
  An issue was discovered in disable_priv_mode in shell.c in GNU Bash through
  5.0 patch 11. By default, if Bash is run with its effective UID not equal to
  its real UID, it will drop privileges by setting its effective UID to its real
  UID. …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-273
  - CWE-273
vendor: gnu
product: bash
affected:
  - bash <= 5.0
  - bash = 5.0
  - hci_management_node
  - oncommand_unified_manager >= 9.5
  - solidfire
  - communications_cloud_native_core_policy = 1.14.0
published: '2019-11-28'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T07:16:50.140'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-18276'
references:
  - url: >-
      http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html
    label: cve@mitre.org
  - url: >-
      https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
    label: cve@mitre.org
  - url: >-
      https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202105-34'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20200430-0003/'
    label: cve@mitre.org
  - url: 'https://www.oracle.com/security-alerts/cpuapr2022.html'
    label: cve@mitre.org
  - url: 'https://www.youtube.com/watch?v=-wGtxJ8opa8'
    label: cve@mitre.org
  - url: >-
      http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
    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://security.gentoo.org/glsa/202105-34'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20200430-0003/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.oracle.com/security-alerts/cpuapr2022.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.youtube.com/watch?v=-wGtxJ8opa8'
    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
  - exploit-available
epss: 0.02608
epssPercentile: 0.8501
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/M-ensimag/CVE-2019-18276'
    - 'https://github.com/SABI-Ensimag/CVE-2019-18276'
  checkedAt: '2026-10-14T07:21:40.625Z'
exploitAvailable: true
ingestedAt: '2026-10-14T07:21:04.824Z'
---

## Overview

An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.

## Affected

- `bash <= 5.0`
- `bash = 5.0`
- `hci_management_node`
- `oncommand_unified_manager >= 9.5`
- `solidfire`
- `communications_cloud_native_core_policy = 1.14.0`

## Remediation

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