Bug 2512255 (CVE-2026-43629)

Summary: CVE-2026-43629 llama.cpp: llama.cpp: Arbitrary code execution via crafted KV cache state files
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: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in llama.cpp. An attacker with local write access to specific directories can exploit a heap buffer overflow vulnerability. By crafting malicious data files, the attacker can cause the system to write beyond intended memory boundaries. This could lead to data corruption or, in severe cases, allow the attacker to execute unauthorized code, potentially compromising the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2514725, 2514726, 2514727, 2514728    
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Description OSIDB Bzimport 2026-08-06 22:25:13 UTC 
llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restore path where the state_read_data() function computes write size without overflow checking, allowing attackers with write access to the slot_save_path directory to corrupt heap memory. Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite.