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CVE-2026-46165— openvswitch: vport: fix self-deadlock on release of tunnel ports

AI Predicted 5.5 Difficulty: Easy EPSS 0.02% · P7

Affected Version Matrix 20

VendorProductVersion RangeStatus
LinuxLinux9d56aced21fb9c104e8a3f3be9b21fbafe448ffc< 8ae6c15fc473c9ad03b0173330cce9a092c76154affected
42f0d3d81209654c08ffdde5a34b9b92d2645896< c741433f6c8dcdecd1d9549d89053761fd1ea413affected
bbe7bd722bfaea36aab3da6cc60fb4a05c644643< 6522d59fb7de55ce0f0f285d962243ddffebb01faffected
98b726ab5e2a4811e27c28e4d041f75bba147eab< 3df75fff46b1517eb479d8e6b8e3500763715dd0affected
6931d21f87bc6d657f145798fad0bf077b82486c< 366c482965c673565ecb8bcfb15d5548f13a6a10affected
6931d21f87bc6d657f145798fad0bf077b82486c< aa69918bd418e700309fdd08509dba324fb24296affected
b8c56a3fc5d879c0928f207a756b0f067f06c6a8affected
6.1.168< 6.1.175affected
… +12 more rows
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I. Basic Information for CVE-2026-46165

Vulnerability Information
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Vulnerability Title
openvswitch: vport: fix self-deadlock on release of tunnel ports
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: vport: fix self-deadlock on release of tunnel ports vports are used concurrently and protected by RCU, so netdev_put() must happen after the RCU grace period. So, either in an RCU call or after the synchronize_net(). The rtnl_delete_link() must happen under RTNL and so can't be executed in RCU context. Calling synchronize_net() while holding RTNL is not a good idea for performance and system stability under load in general, so calling netdev_put() in RCU call is the right solution here. However, when the device is deleted, rtnl_unlock() will call netdev_run_todo() and block until all the references are gone. In the current code this means that we never reach the call_rcu() and the vport is never freed and the reference is never released, causing a self-deadlock on device removal. Fix that by moving the rcu_call() before the rtnl_unlock(), so the scheduled RCU callback will be executed when synchronize_net() is called from the rtnl_unlock()->netdev_run_todo() while the RTNL itself is already released.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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 vport中隧道端口释放时存在自死锁问题，可能导致设备删除时引用无法释放。
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 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc ~ 8ae6c15fc473c9ad03b0173330cce9a092c76154 -
LinuxLinux 7.0 -

II. Public POCs for CVE-2026-46165

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III. Intelligence Information for CVE-2026-46165

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Patches & Fixes for CVE-2026-46165 (6)

Same Patch Batch · Linux · 2026-05-28 · 138 CVEs total

CVE-2026-461959.8 CRITICALsmb: client: validate dacloffset before building DACL pointers
CVE-2026-461379.8 CRITICALmptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-461359.8 CRITICALnvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-461159.8 CRITICALblock: add pgmap check to biovec_phys_mergeable
CVE-2026-461859.1 CRITICALsmb/client: fix out-of-bounds read in symlink_data()
CVE-2026-461199.1 CRITICALlibceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-461559.1 CRITICALsmb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-461258.8 HIGHwifi: mac80211: remove station if connection prep fails
CVE-2026-461748.8 HIGHx86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-461988.8 HIGHbatman-adv: fix integer overflow on buff_pos
CVE-2026-461668.8 HIGHwifi: mac80211: use safe list iteration in radar detect work
CVE-2026-461138.8 HIGHKVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-461528.8 HIGHwifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-462128.8 HIGHbatman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-462388.8 HIGHbatman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-461388.1 HIGHBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-462328.1 HIGHHID: playstation: Clamp num_touch_reports
CVE-2026-461977.8 HIGHdrm/amdkfd: validate SVM ioctl nattr against buffer size
CVE-2026-461767.8 HIGHRDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()
CVE-2026-461457.8 HIGHRDMA/mana: Validate rx_hash_key_len

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46165

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