In the Linux kernel, the following vulnerability has been resolved:
net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink
ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their top, before any
attribute is parsed.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 8
https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67