Bug 2555588 (CVE-2026-112258)

Summary: CVE-2026-112258 gimp: gimp: use-after-free in XCF loader via PROP_LINKED and PROP_SELECTION on channels
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in GIMP. The XCF loader can leave a dangling pointer in the linked-channels list when a linked channel is later destroyed via a selection property. Opening a crafted XCF file can cause a use-after-free in the main GIMP process, leading to a crash and potentially arbitrary code execution.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2558369, 2558370    
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Description OSIDB Bzimport 2026-10-19 13:48:10 UTC 
A flaw was found in the GIMP XCF loader. Marking a channel as linked (PROP_LINKED) stores a raw pointer in linked_channels. A later PROP_SELECTION on the same channel can destroy the object without removing that pointer. At end of load, gimp_item_list_named_new() dereferences the dangling pointer. The CVE-2025-14424 NULL guard does not stop a non-NULL dangling pointer, so this is an incomplete-fix bypass requiring a separate CVE. Reporters demonstrated reclaim of the freed block with attacker-controlled bytes.