Bug 2554794 (CVE-2026-112062)

Summary: CVE-2026-112062 lwip: lwIP: Denial of Service via stack buffer overflow in mDNS response handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in lwIP. An adjacent attacker on the local network can cause a Denial of Service (DoS) by sending specially crafted multicast Domain Name System (mDNS) responses with invalid domain names or record lengths. Processing these malformed packets during a service search triggers a stack-based buffer overflow, corrupting memory and causing the affected device to crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2558154, 2558155    
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Description OSIDB Bzimport 2026-10-18 12:42:31 UTC
lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.