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CVE-2026-74742— veth: fix queue index used to wake the peer txq in veth_poll

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，已解决以下漏洞： veth：修复 veth_poll 中用于唤醒对端 TX 队列的队列索引错误 从 推导需要唤醒的对端 TX 队列索引。该字段仅在 XDP 程序附着时由 中的 初始化。但在纯 GRO/NAPI 路径（ ）中， 从未被调用，因此由于 是零值分配，所有队列的 都保持为 0。 因此，在启用了 GRO 且未附着 XDP 程序的多队列配置中，每个 NAPI 实例都会去唤醒对端的第 0 号 TX 队列。如果 因 已满（ ）而停止了第 1 号对端 TX 队列，则没有任何机制会再次唤醒它：负

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1529 · System Shutdown/Reboot

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 9fe31b3f314534e238aa6d0b6fb492134cbcf8be< b662a1fb4f3a5ea19bac24eea8315b1d05be51e7 affected
dc82a33297fc2c58cb0b2b008d728668d45c0f6a< 73f8dd22b1e533a99ecc3f9b5de6c6daccaecace affected
dc82a33297fc2c58cb0b2b008d728668d45c0f6a< 90bb11fb29d3c55a2c46dc7c386d096b286e7fcf affected
dc82a33297fc2c58cb0b2b008d728668d45c0f6a< 60db47f02bfa2aa688938aa199117ec4f8e31d23 affected
6.12.61< 6.12.105 affected
6.16 affected
< 6.16 unaffected
6.12.105≤ 6.12.* unaffected
… +3 more rows
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I. Basic Information for CVE-2026-74742

Vulnerability Information
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Vulnerability Title
veth: fix queue index used to wake the peer txq in veth_poll
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: veth: fix queue index used to wake the peer txq in veth_poll veth_poll() derives the index of the peer TX queue to wake from rq->xdp_rxq.queue_index. That field is only initialized by xdp_rxq_info_reg() in veth_enable_xdp_range(), which runs only when an XDP program is attached. On the plain GRO/NAPI path (veth_napi_enable_range()) xdp_rxq_info_reg() is never called, so queue_index stays 0 for every queue, as priv->rq is zero-allocated. So in a multi-queue setup with GRO enabled and no XDP program attached, every NAPI instance looks at the peer's TX queue 0. If veth_xmit() stops peer TX queue 1 because the ptr_ring is full (NETDEV_TX_BUSY), nothing ever wakes it again: the poller draining queue 1 wakes queue 0 instead. veth implements no ndo_tx_timeout, so the netdev watchdog does not kick in either, and the queue stays stopped indefinitely. Derive the index from the position of the rq within priv->rq instead, which is correct regardless of whether XDP was ever enabled. Scripts to reproduce the stall are available at https://github.com/netoptimizer/veth-backpressure-performance-testing
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 9fe31b3f314534e238aa6d0b6fb492134cbcf8be ~ b662a1fb4f3a5ea19bac24eea8315b1d05be51e7 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-74742

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III. Intelligence Information for CVE-2026-74742

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Patches & Fixes for CVE-2026-74742 (4)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74742

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