In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: fix BQL reset on SQ re-activation
mlx5e_queue_start() deactivates and re-activates all channels but closes only the queue being restarted. mlx5e_activate_txqsq() then unconditionally calls netdev_tx_reset_queue(), zeroing the BQL counters of channels that kept their in-flight TX WQEs. The next completion then over-charges and trips the BUG_ON() in dql_completed():
kernel BUG at lib/dynamic_queue_limits.c:99! RIP: 0010:dql_completed+0x23d/0x280 Call Trace: <IRQ> mlx5e_poll_tx_cq+0x668/0xa60 mlx5e_napi_poll+0x5b/0x7b0 net_rx_action+0x15a/0x580
Reset BQL only when the SQ has no bytes in flight (sq->cc == sq->pc).
In the case that reset is skipped, the outstanding WQEs will eventually complete and rebalance the dql. The dql->limit is carried across the reset.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.18-debuginfoUpgrade kernel-livepatch-6.18.48-107.148Upgrade perf6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade bpftool6.18Upgrade perf6.18Upgrade kernel6.18-headersUpgrade kernel6.18-debuginfoUpgrade kernel6.18-develUpgrade kernel6.18Upgrade python3-perf6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-tools-develUpgrade kernel6.18-modules-extraUpgrade kernel6.18-modules-extra-commonUpgrade microvm-kernel6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-toolsUpgrade python3-perf6.18 | Sep 30, 2026 | Aug 22, 2026 |
| Redhat_linux | — | No solution exists | Aug 26, 2026 | Aug 22, 2026 |
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