Riskcovery

CVE-2026-74698

net/mlx5e: fix BQL reset on SQ re-activation

State
Published
Severity
Not scored
Published
Aug 22, 2026
Updated
Aug 22, 2026
Reserved
Aug 15, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • b2588ea40ec9472688289c1a644627c0f4a1f33f to before 88664c48d7d1eca8e1ac92da85c89c26af741cf1Affected
  • b2588ea40ec9472688289c1a644627c0f4a1f33f to before d2897717cd222e575599d903d885c48602699800Affected
  • b2588ea40ec9472688289c1a644627c0f4a1f33f to before e7386770be1bf810bcd6af39d1e4bfeab3408430Affected
LinuxLinux
  • 6.17Affected
  • before 6.17Not affected
  • 6.18.45 through 6.18.*Not affected
  • 7.1.9 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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