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gtp: Destroy device along with udp socket's netns dismantle.

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

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
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Publisher date
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