High [CVE-2026-86922] Arbitrary code execution via type confusion
This high-severity Red Hat Linux advisory covers CVE-2026-86922; related products: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat package: webkitgtk3.
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Summary
Arbitrary code execution via type confusion. Red Hat rates this important (CVSS 8.8).
Weakness: CWE-843.
Affected products named by the advisory: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat package: webkitgtk3; Red Hat package: webkitgtk4.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- --- CME Mitigation Guidance (2026-10-20) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to disable or restrict JIT compilation in the browser engine to neutralize the primary vector for type confusion exploitation: upgrade to Safari 27 (or the fixed Webkitgtk builds), which improve state management to prevent object type confusion during web content processing, closing all 2 injection vectors (processing maliciously crafted web content, visiting a malicious website). Until patched, this is a concern on Any platform running applications that process web content with WebKitGTK, so restrict browser navigation and prevent users or applications from processing untrusted web content or visiting unverified websites. As a compensating measure, enable address space layout randomization to make exploitation of corrupted pointers and memory layout resolution more difficult, enforce control flow integrity on indirect branches to prevent execution hijacking after memory corruption, disable or restrict the script engine to prevent processing web content that triggers the type confusion, deploy endpoint detection and response monitoring to catch post-exploitation activity and unexpected process execution, and enforce non-executable memory pages to block code execution within writable heap allocations. These controls limit blast radius and contain exploitation, but they do not fix the underlying type confusion defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-1309 Script Engine Restriction (Sandbox / Disable) (medium)
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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