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Review reviewHigh

CVE-2026-63829

Linux

In the Linux kernel, the following vulnerability has been resolved: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink A tunnel 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. Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in net/core/rtnetlink.c. It...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink A tunnel 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. Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in net/core/rtnetlink.c. It...

Affected product and versions

Product
Linux
Affected versions
>= b57708add31494175be741ed3fd24023b50c3423 < 19275943d8fe903eb7b9aa53e380e41efd042ada, >= b57708add31494175be741ed3fd24023b50c3423 < 866b0f5ae599490bd496fd84581c68ac8b94e6af, >= b57708add31494175be741ed3fd24023b50c3423 < 92b766fc55156e0da2ecd0c2302c971118f8a229, >= b57708add31494175be741ed3fd24023b50c3423 < e54c05ed3d9c28733fb9e5837219aca3691defa3, >= b57708add31494175be741ed3fd24023b50c3423 < 9831bc9ecb402957810c2045c663fbfe9b09e296, >= b57708add31494175be741ed3fd24023b50c3423 < 1697957eb0971d420dde42862b88eb43506a1105, >= b57708add31494175be741ed3fd24023b50c3423 < 47b5d3d506609b08b2e1f7c14f0b681a1953d572, >= b57708add31494175be741ed3fd24023b50c3423 < 8165f7ff57d9667d2bb477ef6af83ede7fed4ad7, >= 3.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
Not available
CVE-2026-63829 — Linux | SECUFOCUS NOW