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CVE-2026-98574— net: bcmgenet: stop Tx NAPI before disabling the queues

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： net: bcmgenet：在禁用队列之前先停止 Tx NAPI 函数与 中处理“网络唤醒（Wake-on-LAN）”的分支，均会先禁用发送（Tx）队列，而在数步之后才停止 Tx NAPI。在此期间，若有一个正在进行的完成操作（completion）调用了 ，由于没有任何机制再次停止该队列，导致数据包可能在发送环（rings）已被释放后仍被写入，从而引发问题。 路径是安全的，因为 会先停止 qdisc（队列调度器）。但 并未执行此操作，因此需要在上述两条路径中，都在禁用

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1069.006

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 254f3239dd070e469f45c3ca8b6ac38e47d6c730< 63bcc2fee6419963e45e7c2cd698fa862409601d affected
254f3239dd070e469f45c3ca8b6ac38e47d6c730< f329d42423089904758f2685cda295de9bf99441 affected
254f3239dd070e469f45c3ca8b6ac38e47d6c730< 7e87508b5c4d81210d0a736ed01962e52f5c4c56 affected
6.15 affected
< 6.15 unaffected
6.18.55≤ 6.18.* unaffected
7.2.9≤ 7.2.* unaffected
7.3-rc5≤ * unaffected
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I. Basic Information for CVE-2026-98574

Vulnerability Information
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Vulnerability Title
net: bcmgenet: stop Tx NAPI before disabling the queues
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 254f3239dd070e469f45c3ca8b6ac38e47d6c730 ~ 63bcc2fee6419963e45e7c2cd698fa862409601d -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-98574

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III. Intelligence Information for CVE-2026-98574

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Other References for CVE-2026-98574 (3)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98583 nfc: nfcmrvl: validate helper command length before pull
CVE-2026-98568 vxlan: use one headroom snapshot for neighbour replies
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98595 udp: remove a disconnected socket from the 4-tuple hash table

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98574

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