gtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl().
In the Linux kernel, the following vulnerability has been resolved: gtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl(). Brad Spengler reported the list_del() corruption splat in gtp_net_exit_batch_rtnl(). [0] Commit eb28fd76c0a0 ("gtp: Destroy device along with udp socket's netns dismantle.") added the for_each_netdev() loop in gtp_net_exit_batch_rtnl() to destroy devices in each netns as done in geneve and ip tunnels. However, this could trigger ->dellink() twice for the same device during ->exit_batch_rtnl(). Say we have two netns A & B and gtp device B that resides in netns B but whose UDP socket is in netns A. 1. cleanup_net() processes netns A and then B. 2. gtp_net_exit_batch_rtnl() finds the device B while iterating netns A's gn->gtp_dev_list and calls ->dellink(). [ device B is not yet unlinked from netns B as unregister_netdevice_many() has not been called. ] 3. gtp_net_exit_batch_rtnl() finds the device B while iterating netns B's for_each_netdev() and calls ->dellink(). gtp_dellink() cleans up the device's hash table, unlinks the dev from gn->gtp_dev_list, and calls unregister_netdevice_queue(). Basically, calling gtp_dellink() multiple times is fine unless CONFIG_DEBUG_LIST is enabled. Let's remove for_each_netdev() in gtp_net_exit_batch_rtnl() and delegate the destruction to default_device_exit_batch() as done in bareudp. [0]: list_del corruption, ffff8880aaa62c00->next (autoslab_size_M_dev_P_net_core_dev_11127_8_1328_8_S_4096_A_64_n_139+0xc00/0x100
CVE-2025-21865
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-2025-21865
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": "c986380c1d5274c4d5e935addc807d6791cc23eb",
"lessThan": "7f86fb07db65a470d0c11f79da551bd9466357dc",
"versionType": "git"
},
{
"status": "affected",
"version": "5f1678346109ff3a6d229d33437fcba3cce9209d",
"lessThan": "33eb925c0c26e86ca540a08254806512bf911f22",
"versionType": "git"
},
{
"status": "affected",
"version": "036f8d814a2cd11ee8ef62b8f3e7ce5dec0ee4f3",
"lessThan": "cb15bb1bde0ba97cbbed9508e45210dcafec3657",
"versionType": "git"
},
{
"status": "affected",
"version": "efec287cbac92ac6ee8312a89221854760e13b34",
"lessThan": "b70fa591b066d52b141fc430ffdee35b6cc87a66",
"versionType": "git"
},
{
"status": "affected",
"version": "bb11f992f5a475bc68ef959f17a55306f0328495",
"lessThan": "9d03e7e37187ae140e716377599493987fb20c5b",
"versionType": "git"
},
{
"status": "affected",
"version": "86f73d4ab2f27deeff22ba9336ad103d94f12ac7",
"lessThan": "ff81b14010362f6188ca26fec22ff05e4da45595",
"versionType": "git"
},
{
"status": "affected",
"version": "eb28fd76c0a08a47b470677c6cef9dd1c60e92d1",
"lessThan": "37e7644b961600ef0beb01d3970c3034a62913af",
"versionType": "git"
},
{
"status": "affected",
"version": "eb28fd76c0a08a47b470677c6cef9dd1c60e92d1",
"lessThan": "4ccacf86491d33d2486b62d4d44864d7101b299d",
"versionType": "git"
},
{
"status": "affected",
"version": "5.4.290",
"lessThan": "5.4.291",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.234",
"lessThan": "5.10.235",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.177",
"lessThan": "5.15.179",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.127",
"lessThan": "6.1.130",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.74",
"lessThan": "6.6.80",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.11",
"lessThan": "6.12.17",
"versionType": "semver"
}
],
"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": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.130",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.80",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.17",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.5",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/gtp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21865
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26965 · Revision 1
- Added to Heist Feed
- Publisher date