gtp: Destroy device along with udp socket's netns dismantle.
In the Linux kernel, the following vulnerability has been resolved: gtp: Destroy device along with udp socket's netns dismantle. gtp_newlink() links the device to a list in dev_net(dev) instead of src_net, where a udp tunnel socket is created. Even when src_net is removed, the device stays alive on dev_net(dev). Then, removing src_net triggers the splat below. [0] In this example, gtp0 is created in ns2, and the udp socket is created in ns1. ip netns add ns1 ip netns add ns2 ip -n ns1 link add netns ns2 name gtp0 type gtp role sgsn ip netns del ns1 Let's link the device to the socket's netns instead. Now, gtp_net_exit_batch_rtnl() needs another netdev iteration to remove all gtp devices in the netns. [0]: ref_tracker: net notrefcnt@000000003d6e7d05 has 1/2 users at sk_alloc (./include/net/net_namespace.h:345 net/core/sock.c:2236) inet_create (net/ipv4/af_inet.c:326 net/ipv4/af_inet.c:252) __sock_create (net/socket.c:1558) udp_sock_create4 (net/ipv4/udp_tunnel_core.c:18) gtp_create_sock (./include/net/udp_tunnel.h:59 drivers/net/gtp.c:1423) gtp_create_sockets (drivers/net/gtp.c:1447) gtp_newlink (drivers/net/gtp.c:1507) rtnl_newlink (net/core/rtnetlink.c:3786 net/core/rtnetlink.c:3897 net/core/rtnetlink.c:4012) rtnetlink_rcv_msg (net/core/rtnetlink.c:6922) netlink_rcv_skb (net/netlink/af_netlink.c:2542) netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1347) netlink_sendmsg (net/netlink/af_netlink.c:1891) ____sys_sendmsg (net/socket.c:711 net/socket.c:726
CVE-2025-21678
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-21678
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "c986380c1d5274c4d5e935addc807d6791cc23eb",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "5f1678346109ff3a6d229d33437fcba3cce9209d",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "036f8d814a2cd11ee8ef62b8f3e7ce5dec0ee4f3",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "efec287cbac92ac6ee8312a89221854760e13b34",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "bb11f992f5a475bc68ef959f17a55306f0328495",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "86f73d4ab2f27deeff22ba9336ad103d94f12ac7",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "eb28fd76c0a08a47b470677c6cef9dd1c60e92d1",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/gtp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.290",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.234",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.177",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.127",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.74",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.11",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/gtp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21678
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26904 · Revision 1
- Added to Heist Feed
- Publisher date