CVE-2026-68432 is a vulnerability in Linux Kernel
Published on August 12, 2026
vxlan: require CAP_NET_ADMIN in the device netns for changelink
In the Linux kernel, the following vulnerability has been resolved:
vxlan: require CAP_NET_ADMIN in the device netns for changelink
A tunnel changelink() operates on at most two netns, dev_net(dev) and
the sticky underlay netns vxlan->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 vxlan->net can rewrite a vxlan
device whose underlay lives in vxlan->net.
vxlan_changelink() validates and applies the new configuration against
vxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the
underlay socket in that netns, so the same reasoning as the tunnel
changelink series applies here.
Gate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of
the op before any attribute is parsed, matching ipgre_changelink() and
the rest of the "require CAP_NET_ADMIN in the device netns for
changelink" series.
Found by 0sec automated security-research tooling (https://0sec.ai).
Products Associated with CVE-2026-68432
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Affected Versions
Linux:- Version 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and below b3793d7dccb192ffff29894d11824db6251acdd5 is affected.
- Version 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and below 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f is affected.
- Version 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and below 730c7e5fea7f06e0cdf21c547222ec93234fd1d6 is affected.
- Version 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and below e8ad0d311e225939a9a6c745d6cc384c7364ec87 is affected.
- Version 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and below 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e is affected.
- Version 4.11 is affected.
- Before 4.11 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc5, <= * is unaffected.