High [CVE-2026-72052] require CAP_NET_ADMIN in the device netns for changelink
This high-severity Red Hat Linux advisory covers CVE-2026-72052 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in the Linux kernel's `ip6_gre` and `ip6erspan` tunnel drivers. The `changelink` functions in these drivers do not adequately verify administrative capabilities (`CAP_NET_ADMIN`) across different network namespaces.
This allows a local attacker, who has `CAP_NET_ADMIN` in one network namespace but not in the tunnel's network namespace, to modify the tunnel's configuration. This could lead to unauthorized changes to network tunnel settings.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-266.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
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