CVE-2016-9401

Publication date 23 January 2017

Last updated 7 August 2025

Ubuntu priority

Negligible

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

Description

popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

Read the notes from the security team

Status

Package Ubuntu Release Status
bash 21.04 hirsute
Fixed 4.4-5ubuntu1
20.10 groovy
Fixed 4.4-5ubuntu1
20.04 LTS focal
Fixed 4.4-5ubuntu1
19.10 eoan
Fixed 4.4-5ubuntu1
19.04 disco
Fixed 4.4-5ubuntu1
18.10 cosmic
Fixed 4.4-5ubuntu1
18.04 LTS bionic
Fixed 4.4-5ubuntu1
17.10 artful
Fixed 4.4-5ubuntu1
17.04 zesty
Fixed 4.4-2ubuntu1.1
16.10 yakkety
Fixed 4.3-15ubuntu1.1
16.04 LTS xenial
Fixed 4.3-14ubuntu1.2
14.04 LTS trusty
Fixed 4.3-7ubuntu1.7
12.04 LTS precise Ignored end of life

Notes

sbeattie

not sure how this has security impact

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
bash

Severity score breakdown

Parameter Value
Base score 5.5 · Medium
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references