Bug 2494763

Summary:	CVE-2026-14164 libarchive: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in init_unpack() [fedora-all]
Product:	[Fedora] Fedora	Reporter:	TEJ RATHI <trathi>
Component:	libarchive	Assignee:	Pavol Sloboda <psloboda>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	db-sig, jamartis, ndevos, praiskup, psloboda
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["ce213b8a-43fa-4d87-9c7a-ae9c06fbf5b5"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-06-30 12:18:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2493411

Description TEJ RATHI 2026-06-30 06:24:16 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A double-free vulnerability exists in the libarchive RAR5 reader subsystem within archive_read_support_format_rar5.c where the state tracking pointer rar->cstate.filtered_buf can be linked to a temporary filter output block during archive decompression. When the unpacking engine subsequently processes an adjacent file or resets its internal state layout via init_unpack(), it releases the allocation mapped to filtered_buf but fails to clear or nullify the underlying pointer variable. A specially crafted RAR5 archive can exploit this lingering dangling pointer by forcing a secondary release operation on the exact same memory address, triggering a standard memory-manager abort that immediately crashes the application and results in a Denial of Service (DoS).