CVE-2026-98574 PUBLISHED

net: bcmgenet: stop Tx NAPI before disabling the queues

Assigner: Linux
Reserved: 25.09.2026 Published: 18.10.2026 Updated: 18.10.2026

In the Linux kernel, the following vulnerability has been resolved:

net: bcmgenet: stop Tx NAPI before disabling the queues

bcmgenet_netif_stop() and the Wake-on-LAN branch of bcmgenet_suspend() both disable the Tx queues first and stop Tx NAPI several steps later. A completion in flight calls netif_tx_wake_queue() in between, and nothing stops the queue again, so a transmit can reach the rings after they have been freed.

Close is safe because dev_deactivate_many() stops the qdisc first. bcmgenet_suspend() does not, so stop Tx NAPI before the queues on both paths.

KASAN on a Raspberry Pi CM4, driven from an MTU change because suspend freezes user space before the callback runs:

BUG: KASAN: use-after-free in bcmgenet_xmit+0x17f8/0x2258 Write of size 8 at addr ffffff8055844a68 by task ksoftirqd/0/14 bcmgenet_xmit+0x17f8/0x2258 dev_hard_start_xmit+0x13c/0x588 sch_direct_xmit+0x108/0x340 __dev_queue_xmit+0x1190/0x3848

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 254f3239dd070e469f45c3ca8b6ac38e47d6c730 to 63bcc2fee6419963e45e7c2cd698fa862409601d (excl.)
  • affected from 254f3239dd070e469f45c3ca8b6ac38e47d6c730 to f329d42423089904758f2685cda295de9bf99441 (excl.)
  • affected from 254f3239dd070e469f45c3ca8b6ac38e47d6c730 to 7e87508b5c4d81210d0a736ed01962e52f5c4c56 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.15 is affected
  • unaffected from 0 to 6.15 (excl.)
  • unaffected from 6.18.55 to 6.18.* (incl.)
  • unaffected from 7.2.9 to 7.2.* (incl.)
  • unaffected from 7.3-rc5 to * (incl.)

References