NVIDIA ConnectX-7 Adapter Cards Firmware Release Notes v28.48.1000 (February 2026 GA Release)

Bug Fixes in this Firmware Version

Internal Ref.

Issue

4578581 / 4626296

Description: Fixed an interoperability issue where, when ConnectX-7 communicates with ConnectX-8 using the probe-based algorithm, bandwidth could become extremely low due to probe packets being dropped.

Keywords: Interoperability, Congestion Control, RTT

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4786813

Description: Fixed an issue where the DPA kernel used unsafe ICM access during process creation/modification, which could cause the DPA kernel to hang during FLR.

Keywords: DPA kernel, FLR

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4804664 / 4806969

Description: Fixed an issue in the User Debugger “query caps” where it returned only the number of capabilities, not the capability bitmap.

Keywords: User Debugger “query caps”

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4859700 / NVbug 5828711

Description: Fixed an issue caused by a race condition in standby/boot power sequencing. In certain timing windows, port power-down could be delayed such that the power-up flow detected the port still transitioning to power-down, causing the sequence to fail and leaving the port stuck in a powered-down state.

Keywords: PXE boot

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4484662

Description: Fixed an issue where mlxlink reported 0 values for SNR (media and host) due to incorrect local port mapping in firmware and an incorrect page number used by MFT.

Keywords: mlxlink

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4744039

Description: Fixed an issue where, due to an SMBus release race condition, the I2C bus could become stuck.

Keywords: SMBus, I2C bus

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4773490 / 4823336

Description: Fixed an issue where fuse values were not aligned with the updated values burned across different ConnectX-7 setups.

Keywords: Fuse values

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4532684 / 4635872 / 4794865 / 4794866 / 4794867 / NVbug 5385446

Description: Fixed an issue by improving the ADP-RETX algorithm to avoid re-arming without performing a retransmission.

Keywords: ADP-RETX algorithm

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4727303 / 4718947

Description: Fixed an issue in the steering definers used for LAG with IPv6 traffic.

Keywords: LAG, IPv6 traffic, steering

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4663915

Description: Fixed an issue where a spurious CNP was sent in response to an out-of-sequence packet.

Keywords: PCC, CNP, OOS, RP, NP

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4450570 / 4780432 / 4780433

Description: Fixed an issue where the root complex sent MCTP-over-PCI messages before a BDF was assigned, causing responses to be sent with BDF 0. The fix ensures that MCTP messages routed by ID are ignored until a valid BDF is assigned.

Keywords: MCTP-over-PCI, BDF, MCTP messages

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

4809134 / 4824635

Description: Fixed an issue where the steering tables were not updated after enabling partial Spectrum-X capabilities (BTH.AR) via LLPD.

Keywords: Steering tables, LLDP

Detected in version: 28.47.1026

Fixed in Release: 28.48.1000

2169950

Description: When decapsulation on a packet occurs, the FCS indication is not calculated correctly.

Keywords: FCS

Discovered in Version: 28.42.1000

Fixed in Release: 28.48.1000

3735988

Description: In IB system, RTT_response_sl feature does not work with Sniffer tools (e.g., Wireshark/Tcpdump/).

Keywords: Health buffer, sniffer, RTT

Discovered in Version: 28.40.1000

Fixed in Release: 28.48.1000

© Copyright 2026, NVIDIA. Last updated on Mar 1, 2026