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CVE-2026-72051— net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink

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存在安全漏洞，该漏洞源于net/ipv6/ip6_tunnel.c文件中的ip6_tnl_changelink()函数未正确检查隧道链接网络命名空间的CAP_NET_ADMIN权限，可能导致具有设备网络命名空间权限但无隧道链接网络命名空间权限的攻击者重写其他网络命名空间中的隧道。

CVSS 8.8 · High EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0bd8762824e73a3cce7b7560a97463301764b616< 2d53ee7daabe733deb81f51d2cc90188f8ad59a1 affected
0bd8762824e73a3cce7b7560a97463301764b616< 82e53e7281c71e174f9f5877c566a623c637b406 affected
0bd8762824e73a3cce7b7560a97463301764b616< 5252db8fb604321133138c7069d6fc3fcd89cdee affected
0bd8762824e73a3cce7b7560a97463301764b616< 2636d061bc237a2446a146e42dcc6563acfa7432 affected
0bd8762824e73a3cce7b7560a97463301764b616< 7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa affected
0bd8762824e73a3cce7b7560a97463301764b616< 234cd54fc500f69db43e37de38603da617fbbeea affected
0bd8762824e73a3cce7b7560a97463301764b616< d4bcc202a3530c856e1cb183384bc9cc8fddab22 affected
0bd8762824e73a3cce7b7560a97463301764b616< 2496fa0b7d180b3ad356b514e7ff93bb14e6140a affected
… +10 more rows
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I. Basic Information for CVE-2026-72051

Vulnerability Information
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Vulnerability Title
net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink ip6_tnl_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Gate ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于net/ipv6/ip6_tunnel.c文件中的ip6_tnl_changelink()函数未正确检查隧道链接网络命名空间的CAP_NET_ADMIN权限，可能导致具有设备网络命名空间权限但无隧道链接网络命名空间权限的攻击者重写其他网络命名空间中的隧道。
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 0bd8762824e73a3cce7b7560a97463301764b616 ~ 2d53ee7daabe733deb81f51d2cc90188f8ad59a1 -
Linux Linux 3.12 -

II. Public POCs for CVE-2026-72051

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III. Intelligence Information for CVE-2026-72051

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Patches & Fixes for CVE-2026-72051 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-74427 9.8 CRITICAL afs: Fix netns teardown to cancel the preallocation charger
CVE-2026-72137 9.8 CRITICAL xfrm: nat_keepalive: avoid double free on send error
CVE-2026-74428 9.8 CRITICAL rxrpc: Fix double unlock in rxrpc_recvmsg()
CVE-2026-72429 9.8 CRITICAL ipv6: ioam: fix type confusion of dst_entry
CVE-2026-72139 9.8 CRITICAL tcp: defer md5sig_info kfree past RCU grace period in tcp_connect
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72051

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