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Vulnerability record · CVE-2019-18276 · published 28 November 2019

CVE-2019-18276: Gnu bash vulnerability

Gnu · Bash

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.

7.8 CVSS 3.1 High EPSS 2.6% · top 15.2% CWE-273 · CWE-273
7.8CVSS 3.1 base score, v2 7.2
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
14References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html ExploitThird Party AdvisoryVDB Entry
https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff PatchThird Party Advisory
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%
https://security.gentoo.org/glsa/202105-34 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200430-0003/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.youtube.com/watch?v=-wGtxJ8opa8 ExploitThird Party Advisory
http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html ExploitThird Party AdvisoryVDB Entry
https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff PatchThird Party Advisory
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%
https://security.gentoo.org/glsa/202105-34 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200430-0003/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.youtube.com/watch?v=-wGtxJ8opa8 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-18276), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.