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CVE-2026-80647— RDMA/hns: Fix warning in poll cq direct mode

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.5版本存在安全漏洞，该漏洞源于在poll cq direct mode下，由ib_alloc_cq()分配的CQs始终具有comp_handler，驱动重置时该处理器被错误调用，触发WARN_ONCE()警告。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1234

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f295e4cece5cb4c60715fed539abcd62468f9ef1< 95b2e44bc1e5c5d93bb58e178d914dd99a3baa6f affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< e7d363c0ffa836ac1d89657686cad241392c5eb2 affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< c028c1977b6e61eee26bb69332453efb6513f83b affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< a075a7acd155ffdd058e72eb3f4cce1207ebafa1 affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< 9f05319149c14acedb83e2c2842ec4b38992ad9f affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< 16138ea9833d6bb1bed37a3321f282242704bf02 affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< 1e56f8886d64288cf88d80af44c7b9148aeaa98b affected
f295e4cece5cb4c60715fed539abcd62468f9ef1< 3f19c2a3852e6ba75f3e92dd5edc4e07f3d07f4a affected
… +10 more rows
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I. Basic Information for CVE-2026-80647

Vulnerability Information
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Vulnerability Title
RDMA/hns: Fix warning in poll cq direct mode
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/hns: Fix warning in poll cq direct mode CQs allocated by ib_alloc_cq() always have a comp_handler. Though in direct mode this handler is never expected to be called, it is still called when the driver is reset, triggering the following WARN_ONCE(): Call trace: ib_cq_completion_direct+0x38/0x60 hns_roce_cq_completion+0x54/0x90 (hns_roce_hw_v2] hns_roce_handle_device_err+Ox1c8/0x340 [hns_roce_hw_v2] hns_roce_hw_v2_uninit_instance.constprop.0+0x34/0x70 [hns_roce_hw_v2] hns_roce_hw_v2_reset_notify+0xc4/0xe0 [hns_roce_hw_v2] hclge_notify_roce_client+0x60/0xbc [hclge] hclge_reset_rebuild+0x48/0x34c [hclge] hclge_reset_subtask+0xcc/0xec [hclge] hclge_reset_service_task+0x80/0x160 [hclge] hclge_service_task+0x50/0x80 (hclge] process_one_work+0x1cc/0x4d0 worker_thread+0x154/0x414 kthread+0x104/0x144 ret_from_fork+0x10/0x18
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.5版本存在安全漏洞，该漏洞源于在poll cq direct mode下，由ib_alloc_cq()分配的CQs始终具有comp_handler，驱动重置时该处理器被错误调用，触发WARN_ONCE()警告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f295e4cece5cb4c60715fed539abcd62468f9ef1 ~ 95b2e44bc1e5c5d93bb58e178d914dd99a3baa6f -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-80647

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III. Intelligence Information for CVE-2026-80647

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Patches & Fixes for CVE-2026-80647 (7)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80724 8.8 HIGH ptp: vmclock: prevent read-only mappings from becoming writable

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80647

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