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AMD says CVE-2026-43598, a vulnerability in the ROCm Communication Collectives Library (RCCL), could let an attacker disclose memory, bypass ASLR and potentially execute code in the RCCL process. AMD lists nine affected Instinct data-center GPU models and recommends ROCm 7.14 as mitigation. The bulletin describes a compromised peer rank or a network-adjacent attacker; it does not report confirmed exploitation.
What is the AMD RCCL vulnerability?
AMD Product Security bulletin AMD-SB-6033 covers CVE-2026-43598, an improper input-validation flaw in RCCL. AMD says insufficient validation of attacker-controlled data in the RCCL proxy communication path could expose memory contents and bypass address space layout randomization (ASLR), potentially enabling remote code execution in the context of the RCCL process.
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These are potential consequences, not a report of an observed attack. AMD’s bulletin does not say exploitation is occurring in the wild or provide a public proof of concept.
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Can someone remotely execute code on an AMD GPU cluster?
RCE is a possible outcome under the described conditions, not an assertion that any reachable cluster can be taken over. AMD’s description identifies a compromised peer rank or a network-adjacent attacker as sources of input to the RCCL communication path. Its published CVSS 4.0 vector is CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N: it marks the attack as network-based, high complexity and requiring low privileges. “Remote” therefore does not mean unauthenticated access from anywhere.
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AMD assigns the vulnerability a base score of 7.7, while cautioning that implementation details can change the score: “Specific CVSS scores may change subject to your implementation. We encourage you to calculate CVSS scores independently for your system.” Use the published score as AMD’s assessment, not as a substitute for evaluating your cluster’s own peer access and network exposure.
Is my AMD Instinct GPU affected by CVE-2026-43598?
AMD’s affected-product table names these nine Instinct data-center GPU models:
Rank #2
- High-Performance 4K Gaming: AMD Radeon RX 7900 XT GPU with 20GB GDDR6 memory on 320-bit bus delivers exceptional 4K gaming and content creation performance
- Advanced RDNA 3 Architecture: 84 AMD RDNA 3 Compute Units with Ray Tracing and AI Accelerators, plus 80MB AMD Infinity Cache technology
- Impressive Clock Speeds: Boost clock up to 2450 MHz and game clock of 2075 MHz with 20 Gbps memory speed for smooth, high-frame-rate gaming
- Phantom Gaming 3X Cooling System: Triple striped ring fans with reinforced metal frame and 0dB silent cooling technology for optimal thermal performance
- Modern Display Connectivity: Three DisplayPort 2.1 and one HDMI 2.1 outputs support high-resolution, high-refresh-rate displays and advanced gaming features
- Instinct MI210
- Instinct MI250 and MI250X
- Instinct MI300A, MI300X and MI308X
- Instinct MI325X
- Instinct MI350X and MI355X
This includes MI300X and MI350X. AMD says products believed not to be affected are omitted from the table, so an unlisted model should not be treated as proof that every other AMD product is unaffected.
How do I fix the AMD RCCL vulnerability?
AMD recommends the mitigated version ROCm 7.14. Apply it through your normal ROCm deployment process, validating the version actually installed across cluster nodes. The advisory does not give a configuration workaround, detailed firewall rules, exploit indicators or a model-by-model alternative-version matrix.
Rank #3
- Chipset: AMD RX 7600
- Memory: 8GB GDDR6
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- Boost Clock: Up to 2655 MHz
- Inventory: Record the Instinct GPU model and deployed ROCm version on each relevant node.
- Match: Compare that inventory with AMD’s affected-product list and your current ROCm deployment.
- Plan and upgrade: Schedule and apply AMD’s recommended ROCm 7.14 mitigation using the deployment process appropriate to your cluster.
- Assess exposure: Review which users or systems can participate as peer ranks and which networks can reach RCCL proxy communication paths. Use those findings to set upgrade priority.
- Verify the advisory: Check AMD-SB-6033 for updates before acting, since AMD revised it after publication and notes that technical information may change.
When did AMD disclose the flaw?
AMD lists September 30, 2026 as the bulletin’s initial publication date and says its October 6, 2026 revision corrected the CVE in the product table. AMD’s Product Security index independently lists AMD-SB-6033 / CVE-2026-43598 with those publication and update dates. AMD credits researcher Luna Nova for reporting the issue through coordinated vulnerability disclosure.
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