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.
Fix
Public exploits 2
- M-ensimag/CVE-2019-18276 PoC on GitHub
- SABI-Ensimag/CVE-2019-18276 PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
- https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.8 · gnu, netapp, oracleNVD modified 2026-10-14 07:16
Affected (CPE criteria) 19
cpe:2.3:a:gnu:bash:*:*:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:beta1:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:beta2:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch1:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch10:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch11:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch2:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch3:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch4:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch5:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch6:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch7:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch8:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:patch9:*:*:*:*:*:*cpe:2.3:a:gnu:bash:5.0:rc1:*:*:*:*:*:*cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:oncommand_unified_manager:*:*:*:*:*:vmware_vsphere:*:*cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*
References 15
- http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry
- https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff Patch, Third Party Advisory
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- 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 Patch, Third Party Advisory
- https://www.youtube.com/watch?v=-wGtxJ8opa8 Exploit, Third Party Advisory
- http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry
- https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff Patch, Third Party Advisory
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- 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 Patch, Third Party Advisory
- https://www.youtube.com/watch?v=-wGtxJ8opa8 Exploit, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html