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CVE-2026-98574

Linux: net: bcmgenet: stop Tx NAPI before disabling the queues

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in63bcc2fee6419963e45e7c2cd698fa862409601dAlso 7e87508b5c4d81210d0a736ed01962e52f5c4c56CVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 63bcc2fee6419963e45e7c2cd698fa862409601dLinuxCVE List
  • 7e87508b5c4d81210d0a736ed01962e52f5c4c56LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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

Text from CVE List

Affected versions 8

  • Linuxaffected: 254f3239dd070e469f45c3ca8b6ac38e47d6c730 before 63bcc2fee6419963e45e7c2cd698fa862409601dCVE List
  • Linuxaffected: 254f3239dd070e469f45c3ca8b6ac38e47d6c730 before f329d42423089904758f2685cda295de9bf99441CVE List
  • Linuxaffected: 254f3239dd070e469f45c3ca8b6ac38e47d6c730 before 7e87508b5c4d81210d0a736ed01962e52f5c4c56CVE List
  • Linuxaffected: 6.15CVE List
  • Linuxunaffected: all versions before 6.15CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 3