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AMD says a vulnerability in its ROCm Communication Collectives Library (RCCL), tracked as CVE-2026-43598, 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 advisory describes a conditional risk involving a compromised peer rank or 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 vulnerability in RCCL, the ROCm Communication Collectives Library. AMD says insufficient validation of attacker-controlled data in RCCL’s proxy communication path could allow memory disclosure and ASLR bypass, potentially leading to remote code execution in the context of the RCCL process.
Remote code execution is a possible consequence, not a confirmed outcome or evidence of an incident. AMD’s advisory does not say that the flaw is being exploited in the wild, and it does not provide a public proof of concept.
Can someone remotely execute code on an AMD GPU cluster?
AMD describes a compromised peer rank or a network-adjacent attacker as a source of attacker-controlled input. 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, with a base score of 7.7. The network attack vector does not mean unauthenticated access from anywhere: the vector specifies low privileges required and high attack complexity, and the advisory places the attack in relation to RCCL’s communication path.
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AMD cautions that “Specific CVSS scores may change subject to your implementation. We encourage you to calculate CVSS scores independently for your system.” Cluster topology, access controls, and which peers can participate in collectives affect how an operator should assess exposure.
Is my AMD Instinct GPU affected by CVE-2026-43598?
AMD’s data-center GPU table names these nine affected 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
- Instinct MI250X
- Instinct MI300A
- Instinct MI300X
- Instinct MI308X
- Instinct MI325X
- Instinct MI350X
- Instinct MI355X
That list 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. Check the bulletin’s current product table for the model in your deployment.
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AMD recommends the mitigated version ROCm 7.14. The bulletin’s MI210 row gives a mitigation release date of July 15, 2026; it does not show a separate release date in the other model rows. AMD does not provide a model-by-model alternative version matrix or a configuration workaround.
Rank #3
- Chipset: AMD RX 7600
- Memory: 8GB GDDR6
- XFX SWFT Dual Fan Cooling Solution
- Boost Clock: Up to 2655 MHz
- Inventory your cluster: record Instinct GPU models and the ROCm versions deployed on each relevant node.
- Match the inventory to AMD’s advisory: compare the models with the affected-product table and verify the current ROCm deployment.
- Plan the update: schedule and apply ROCm 7.14 through the deployment process appropriate to your environment.
- Assess access to RCCL: review which users or workloads can join as peer ranks and which networks can reach RCCL proxy communication paths. Use these details to prioritize the update.
- Re-check the bulletin: consult AMD-SB-6033 for updates before acting, since AMD has revised the advisory and says its technical information may change.
The advisory does not prescribe firewall rules, provide exploit indicators, or specify a detailed network-control workaround. Do not treat an improvised network restriction as a vendor-confirmed substitute for the recommended mitigation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When did AMD disclose CVE-2026-43598?
AMD lists September 30, 2026 as the initial publication date and says its October 6, 2026 revision corrected the CVE in the product table. AMD’s Product Security index also lists AMD-SB-6033 / CVE-2026-43598 with those publication and update dates. AMD credits Luna Nova (lunnova.dev) for reporting the issue through coordinated vulnerability disclosure.
What the advisory does not establish
- It does not report active exploitation, a confirmed cluster compromise, or a public proof of concept.
- It does not give a configuration-based workaround, specific firewall rules, or indicators of compromise.
- It does not provide a model-by-model alternative mitigation-version matrix beyond recommending ROCm 7.14.
Do not confuse this CVE with a separate RCCL performance issue described in the ROCm 7.2.0 release notes: that note concerned selected collectives and message sizes on MI300X systems with Pollara AI NICs and says the performance issue was resolved. It is not the mitigation for CVE-2026-43598.
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