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

CVSS 7.8 · High EPSS 0.01% · P2
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux a9020fde67a6eb77f8130feff633189f99264db1 ~ 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc -
LinuxLinux 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-2026-316859.4 CRITICALnetfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-316829.1 CRITICALbridge: br_nd_send: linearize skb before parsing ND options
CVE-2026-316837.8 HIGHbatman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-316807.8 HIGHnet: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-316757.8 HIGHnet/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-316737.8 HIGHaf_unix: read UNIX_DIAG_VFS data under unix_state_lock
CVE-2026-316767.5 HIGHrxrpc: only handle RESPONSE during service challenge
CVE-2026-316797.1 HIGHopenvswitch: validate MPLS set/set_masked payload length
CVE-2026-316747.1 HIGHnetfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31684net: sched: act_csum: validate nested VLAN headers
CVE-2026-31681netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677crypto: 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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