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CVE-2021-33574

Publication date 25 May 2021

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.

Read the notes from the security team

Status

Package Ubuntu Release Status
eglibc 22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
glibc 22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
18.04 LTS bionic Ignored
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release

Notes

sbeattie

see https://sourceware.org/bugzilla/show_bug.cgi?id=27896#c4 for a discussion on what pre-requisites are needed for an attack based on this vulnerability. affects more than just 2.32 and 2.33

mdeslaur

upstream fix introduced CVE-2021-38604, if this CVE is fixed, the other needs to be fixed also. Fixing this CVE would require introducing new symbols which will likely cause regressions for running systems. We will not be fixing this CVE in Ubuntu stable releases. Marking as ignored.

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H