Bug 1986863 (CVE-2021-21775)

Summary: CVE-2021-21775 webkitgtk: Use-after-free in ImageLoader dispatchPendingErrorEvent leading to information leak and possibly code execution
Product: [Other] Security Response Reporter: Michael Kaplan <mkaplan>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: erack, gnome-sig, mcatanza, tpopela
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: webkitgtk 2.32.3 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-11-10 00:52:24 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1999828    
Bug Blocks: 1986910    

Description Michael Kaplan 2021-07-28 13:33:02 UTC
A use-after-free vulnerability exists in the way certain events are processed for ImageLoader objects of WebKit. A specially crafted web page can lead to a potential information leak and further memory corruption. In order to trigger the vulnerability, a victim must be tricked into visiting a malicious webpage.

Comment 1 Tomas Hoger 2021-08-30 14:47:08 UTC
Upstream advisory:


Comment 2 Tomas Hoger 2021-08-31 15:13:27 UTC
Talos advisory with more details:


Comment 4 errata-xmlrpc 2021-11-09 18:31:33 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381

Comment 5 Product Security DevOps Team 2021-11-10 00:52:23 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):