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CVE-2026-68142

geneve: require CAP_NET_ADMIN in the device netns for changelink

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: geneve: 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 geneve->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 geneve->net can rewrite a geneve device whose underlay lives in geneve->net. geneve_changelink() applies the new configuration against geneve->net: geneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair reopen the underlay sockets in that netns (geneve_sock_add() uses geneve->net), so the same reasoning as the tunnel changelink series applies here. Gate geneve_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).

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in a5522963c57f12df5f9db804ebfc472b58eef0ae; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in 278c6a31ee27c931c722202c8c06cc3253923254; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in 11a7d989d00160481a273eb4f7f05f64b5a6ffdf; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in 2abdacc927c92fa6a9cc8341e8c9b88dcb561553; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in 9de5518fc1fab583526a8f66b8e505c4864dc60a; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in f8c498585d2a08aa623748353c3e61467b7e9fd2; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in 95f45e20f1b2cec13823f0f68060ab4b2261b2c1; From 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a · fixed in 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01

  • Linux Linux

    4.14

  • KernelLinux

    From 4.14.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org