net: bcmgenet: stop Tx NAPI before disabling the queues

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98574
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:09 UTC
Updated2026-10-19 10:19:16 UTC
DescriptionIn 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 254f3239dd070e469f45c3ca8b6ac38e47d6c730 63bcc2fee6419963e45e7c2cd698fa862409601d git Not specified
CNA Linux Linux affected 254f3239dd070e469f45c3ca8b6ac38e47d6c730 f329d42423089904758f2685cda295de9bf99441 git Not specified
CNA Linux Linux affected 254f3239dd070e469f45c3ca8b6ac38e47d6c730 7e87508b5c4d81210d0a736ed01962e52f5c4c56 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7e87508b5c4d81210d0a736ed01962e52f5c4c56 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/63bcc2fee6419963e45e7c2cd698fa862409601d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f329d42423089904758f2685cda295de9bf99441 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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