CVE-2026-68432vxlan: require CAP_NET_ADMIN in the device netns for changelink
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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).
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8bcdc4f3a20be949df54b67e5ae2734daabb5792 before b95a8743e58f7efed5ddc4cb73829b66f17feab0; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792 before 7465ade989ba84adc2bfa58bad3ca25d249f0f7a; 8bcdc4f3a20be949df54b67e5ae2734daabb5792 builds before 0aa580a8bbbed2507b4582a1f0ef581d480d06ed; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792 before b3793d7dccb192ffff29894d11824db6251acdd5; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792 before 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792 before 730c7e5fea7f06e0cdf21c547222ec93234fd1d6; from 8bcdc4f3a20be949df54b67e5ae2734daabb5792 before e8ad0d311e225939a9a6c745d6cc384c7364ec87; 8bcdc4f3a20be949df54b67e5ae2734daabb5792 builds before 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e | CNA record |
References
- https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0
- https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a
- https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed
- https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5
- https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f
- https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6
- https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87
- https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.