CVE-2026-74698 is a vulnerability in Linux Kernel
Published on August 22, 2026
net/mlx5e: fix BQL reset on SQ re-activation
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.
Products Associated with CVE-2026-74698
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Affected Versions
Linux:- Version b2588ea40ec9472688289c1a644627c0f4a1f33f and below 88664c48d7d1eca8e1ac92da85c89c26af741cf1 is affected.
- Version b2588ea40ec9472688289c1a644627c0f4a1f33f and below d2897717cd222e575599d903d885c48602699800 is affected.
- Version b2588ea40ec9472688289c1a644627c0f4a1f33f and below e7386770be1bf810bcd6af39d1e4bfeab3408430 is affected.
- Version 6.17 is affected.
- Before 6.17 is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.