Not yet scoredPublished Aug 22, 2026

CVE-2026-74698net/mlx5e: fix BQL reset on SQ re-activation

Updated under an hour ago (2026-10-19 10:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Aug 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b2588ea40ec9472688289c1a644627c0f4a1f33f before 88664c48d7d1eca8e1ac92da85c89c26af741cf1; from b2588ea40ec9472688289c1a644627c0f4a1f33f before d2897717cd222e575599d903d885c48602699800; from b2588ea40ec9472688289c1a644627c0f4a1f33f before e7386770be1bf810bcd6af39d1e4bfeab3408430	CNA record

References

https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1
https://git.kernel.org/stable/c/d2897717cd222e575599d903d885c48602699800
https://git.kernel.org/stable/c/e7386770be1bf810bcd6af39d1e4bfeab3408430

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.