Critical Valkey Security Update for openSUSE Leap 15.6: CVE-2025-27151 & CVE-2025-49112 Patches

 

Critical Valkey security update for openSUSE Leap 15.6 fixes CVE-2025-27151 (stack overflow) and CVE-2025-49112 (integer underflow). Learn patch instructions, exploit details, and mitigation steps to secure Linux servers now.

Overview: High-Risk Vulnerabilities Patched in Valkey

The latest SUSE-SU-2025:02231-1 security update addresses two critical vulnerabilities in Valkey (a high-performance Redis-compatible database) for openSUSE Leap 15.6 and Server Applications Module 15-SP6. 

These flaws could lead to stack overflow attacks and integer underflow exploits, risking system compromise.

Why This Matters?

• CVE-2025-27151: Missing filename size checks enable stack-based buffer overflows, allowing arbitrary code execution.

• CVE-2025-49112: Integer underflow in setDeferredReply may crash services or trigger remote exploits.

🔴 Severity: Moderate (CVSS scores pending) – Immediate patching recommended for Linux servers.

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Patch Instructions: Secure Your System Now

Method 1: Automated Update (Recommended)

bash

# For openSUSE Leap 15.6  
zypper in -t patch SUSE-2025-2231=1 openSUSE-SLE-15.6-2025-2231=1  

# For Server Applications Module 15-SP6  
zypper in -t patch SUSE-SLE-Module-Server-Applications-15-SP6-2025-2231=1  

Method 2: Manual Patch via YaST

1. Launch YaST → Online Update.

2. Search for SUSE-2025-2231.

3. Apply the patch and restart affected services.

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Affected Packages & Architectures

Package	Architectures (Leap 15.6)	Module 15-SP6
valkey-8.0.2	aarch64, ppc64le, x86_64, i586	aarch64, x86_64
valkey-devel	s390x, ppc64le	s390x, ppc64le
valkey-debuginfo	All supported	All supported
valkey-compat-redis	noarch	noarch

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Technical Deep Dive: Exploit Analysis

CVE-2025-27151: Stack Overflow Vulnerability

• Root Cause: Unbounded filename writes in Valkey’s logging subsystem.

• Impact: Attackers could overwrite stack memory, leading to RCE (Remote Code Execution).

• Mitigation: Patch enforces 256-byte filename limits.

CVE-2025-49112: Integer Underflow in setDeferredReply

• Trigger: Malformed client requests cause a signed/unsigned mismatch.

• Risk: Denial-of-Service (DoS) or memory corruption.

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References & Official Sources

• SUSE CVE-2025-27151 Advisory

• Bugzilla #1243804 (Stack Overflow)

• Valkey Documentation (Third-party resource for best practices)

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FAQ: Valkey Security Update

Q: Is this update backward-compatible with Redis?

A: Yes—valkey-compat-redis ensures Redis API compatibility.

Q: How urgent is this patch?

A: Moderate urgency—exploits require specific conditions but are feasible in shared hosting.

Q: Can I verify the patch post-installation?

A: Run zypper patches --grep SUSE-2025-2231 to confirm.