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CVE-2026-74698

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version b2588ea40ec9472688289c1a644627c0f4a1f33f
Version < 88664c48d7d1eca8e1ac92da85c89c26af741cf1
Status affected
Version b2588ea40ec9472688289c1a644627c0f4a1f33f
Version < d2897717cd222e575599d903d885c48602699800
Status affected
Version b2588ea40ec9472688289c1a644627c0f4a1f33f
Version < e7386770be1bf810bcd6af39d1e4bfeab3408430
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 6.17
Status affected
Version 0
Version < 6.17
Status unaffected
Version <= 6.18.*
Version 6.18.45
Status unaffected
Version <= 7.1.*
Version 7.1.9
Status unaffected
Version <= *
Version 7.2
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.21% 0.11
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/88664c48d7d1eca8e1ac92da85c89c26af741cf1
https://git.kernel.org/stable/c/d2897717cd222e575599d903d885c48602699800
https://git.kernel.org/stable/c/e7386770be1bf810bcd6af39d1e4bfeab3408430