CVE-2026-72055
In the Linux kernel, the following vulnerability has been resolved: net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink vti6_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink vti6_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. Gate vti6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 0.17% probability · 6th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0b2f9c908f930ec4be17d389723f9a202d6a883c
- https://git.kernel.org/stable/c/b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf
- https://git.kernel.org/stable/c/c64b9ae7eb97e81d54b792910a3aeafd92566c79
- https://git.kernel.org/stable/c/e2ac3b242c37dff323a964962e43854f4b1a2b79
- https://git.kernel.org/stable/c/ef897249dc957089e6f7f11ceea699e093ad51bd
- https://git.kernel.org/stable/c/f5254e7766b4ac02b66b2ccef896cd278503cb11
- https://git.kernel.org/stable/c/f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba
- https://git.kernel.org/stable/c/f97e93ebf2f9b8ef3b87f7a9371255e84d151587
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.