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CVE-2026-31678— openvswitch: defer tunnel netdev_put to RCU release

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于openvswitch隧道设备销毁时过早释放网络设备引用，可能导致并发读取时出现竞争条件。

CVSS 7.8 · High EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux a9020fde67a6eb77f8130feff633189f99264db1< 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc affected
a9020fde67a6eb77f8130feff633189f99264db1< 42f0d3d81209654c08ffdde5a34b9b92d2645896 affected
a9020fde67a6eb77f8130feff633189f99264db1< bbe7bd722bfaea36aab3da6cc60fb4a05c644643 affected
a9020fde67a6eb77f8130feff633189f99264db1< 98b726ab5e2a4811e27c28e4d041f75bba147eab affected
a9020fde67a6eb77f8130feff633189f99264db1< b8c56a3fc5d879c0928f207a756b0f067f06c6a8 affected
a9020fde67a6eb77f8130feff633189f99264db1< 6931d21f87bc6d657f145798fad0bf077b82486c affected
4.3 affected
< 4.3 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-31678

Vulnerability Information
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Vulnerability Title
openvswitch: defer tunnel netdev_put to RCU release
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev. Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于openvswitch隧道设备销毁时过早释放网络设备引用，可能导致并发读取时出现竞争条件。
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 a9020fde67a6eb77f8130feff633189f99264db1 ~ 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc -
Linux Linux 4.3 -

II. Public POCs for CVE-2026-31678

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III. Intelligence Information for CVE-2026-31678

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Same Patch Batch · Linux · 2026-04-25 · 13 CVEs total

CVE-2026-31685 9.4 CRITICAL netfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-31682 9.1 CRITICAL bridge: br_nd_send: linearize skb before parsing ND options
CVE-2026-31683 7.8 HIGH batman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-31680 7.8 HIGH net: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-31675 7.8 HIGH net/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-31673 7.8 HIGH af_unix: read UNIX_DIAG_VFS data under unix_state_lock
CVE-2026-31676 7.5 HIGH rxrpc: only handle RESPONSE during service challenge
CVE-2026-31679 7.1 HIGH openvswitch: validate MPLS set/set_masked payload length
CVE-2026-31674 7.1 HIGH netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31684 net: sched: act_csum: validate nested VLAN headers
CVE-2026-31681 netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677 crypto: af_alg - limit RX SG extraction by receive buffer budget

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31678

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