CVE-2026-72051
net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink
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.
INFO
Published Date :
Aug. 15, 2026, 6:21 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the kernel patch for net: ip6_tunnel: require CAP_NET_ADMIN.
- Ensure CAP_NET_ADMIN is checked in the device netns.
- Gate ip6_tnl_changelink() on rtnl_dev_link_net_capable().
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72051.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72051 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72051
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72051 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72051 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '2636d061bc237a2446a146e42dcc6563acfa7432', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '234cd54fc500f69db43e37de38603da617fbbeea', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': 'd4bcc202a3530c856e1cb183384bc9cc8fddab22', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '2496fa0b7d180b3ad356b514e7ff93bb14e6140a', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '2636d061bc237a2446a146e42dcc6563acfa7432', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '234cd54fc500f69db43e37de38603da617fbbeea', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': 'd4bcc202a3530c856e1cb183384bc9cc8fddab22', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '2496fa0b7d180b3ad356b514e7ff93bb14e6140a', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '2636d061bc237a2446a146e42dcc6563acfa7432', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '234cd54fc500f69db43e37de38603da617fbbeea', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': 'd4bcc202a3530c856e1cb183384bc9cc8fddab22', 'versionType': 'git'}, {'status': 'affected', 'version': '0bd8762824e73a3cce7b7560a97463301764b616', 'lessThan': '2496fa0b7d180b3ad356b514e7ff93bb14e6140a', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/234cd54fc500f69db43e37de38603da617fbbeea Added Reference https://git.kernel.org/stable/c/2496fa0b7d180b3ad356b514e7ff93bb14e6140a Added Reference https://git.kernel.org/stable/c/2636d061bc237a2446a146e42dcc6563acfa7432 Added Reference https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa Added Reference https://git.kernel.org/stable/c/d4bcc202a3530c856e1cb183384bc9cc8fddab22