vxlan: require CAP_NET_ADMIN in the device netns for changelink

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68432
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 00:17:43 UTC
Updated2026-08-12 00:17:43 UTC
DescriptionIn 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).

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8bcdc4f3a20be949df54b67e5ae2734daabb5792 b3793d7dccb192ffff29894d11824db6251acdd5 git Not specified
CNA Linux Linux affected 8bcdc4f3a20be949df54b67e5ae2734daabb5792 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f git Not specified
CNA Linux Linux affected 8bcdc4f3a20be949df54b67e5ae2734daabb5792 730c7e5fea7f06e0cdf21c547222ec93234fd1d6 git Not specified
CNA Linux Linux affected 8bcdc4f3a20be949df54b67e5ae2734daabb5792 e8ad0d311e225939a9a6c745d6cc384c7364ec87 git Not specified
CNA Linux Linux affected 8bcdc4f3a20be949df54b67e5ae2734daabb5792 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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