CVE-2025-21884
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21884
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21884.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-21884
- Downstream
- Related
- Published
- 2025-03-27T14:57:12Z
- Modified
- 2025-10-17T22:25:13.980379Z
- Summary
- net: better track kernel sockets lifetime
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: better track kernel sockets lifetime
While kernel sockets are dismantled during pernetoperations->exit(), their freeing can be delayed by any tx packets still held in qdisc or device queues, due to skbsetownerw() prior calls.
This then trigger the following warning from reftrackerdir_exit() [1]
To fix this, make sure that kernel sockets own a reference on net->passive.
Add sknetrefcnt_upgrade() helper, used whenever a kernel socket is converted to a refcounted one.
[1]
[ 136.263918][ T35] reftracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at [ 136.263918][ T35] skalloc+0x2b3/0x370 [ 136.263918][ T35] inet6create+0x6ce/0x10f0 [ 136.263918][ T35] _sockcreate+0x4c0/0xa30 [ 136.263918][ T35] inetctlsockcreate+0xc2/0x250 [ 136.263918][ T35] igmp6netinit+0x39/0x390 [ 136.263918][ T35] opsinit+0x31e/0x590 [ 136.263918][ T35] setupnet+0x287/0x9e0 [ 136.263918][ T35] copynetns+0x33f/0x570 [ 136.263918][ T35] createnewnamespaces+0x425/0x7b0 [ 136.263918][ T35] unsharensproxynamespaces+0x124/0x180 [ 136.263918][ T35] ksysunshare+0x57d/0xa70 [ 136.263918][ T35] _x64sysunshare+0x38/0x40 [ 136.263918][ T35] dosyscall64+0xf3/0x230 [ 136.263918][ T35] entrySYSCALL64afterhwframe+0x77/0x7f [ 136.263918][ T35] [ 136.343488][ T35] reftracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at [ 136.343488][ T35] skalloc+0x2b3/0x370 [ 136.343488][ T35] inet6create+0x6ce/0x10f0 [ 136.343488][ T35] _sockcreate+0x4c0/0xa30 [ 136.343488][ T35] inetctlsockcreate+0xc2/0x250 [ 136.343488][ T35] ndiscnetinit+0xa7/0x2b0 [ 136.343488][ T35] opsinit+0x31e/0x590 [ 136.343488][ T35] setupnet+0x287/0x9e0 [ 136.343488][ T35] copynetns+0x33f/0x570 [ 136.343488][ T35] createnewnamespaces+0x425/0x7b0 [ 136.343488][ T35] unsharensproxynamespaces+0x124/0x180 [ 136.343488][ T35] ksysunshare+0x57d/0xa70 [ 136.343488][ T35] _x64sysunshare+0x38/0x40 [ 136.343488][ T35] dosyscall64+0xf3/0x230 [ 136.343488][ T35] entrySYSCALL64afterhwframe+0x77/0x7f
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2668e038800b946d269f96ec1b258c01930a242c
- https://git.kernel.org/stable/c/4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb
- https://git.kernel.org/stable/c/5c70eb5c593d64d93b178905da215a9fd288a4b5
- https://git.kernel.org/stable/c/c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0cafd77dcd032d1687efaba5598cf07bce85997fFixed2668e038800b946d269f96ec1b258c01930a242c
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0cafd77dcd032d1687efaba5598cf07bce85997fFixed4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0cafd77dcd032d1687efaba5598cf07bce85997fFixedc31a732fac46b00b95b78fcc9c37cb48dd6f2e0c
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0cafd77dcd032d1687efaba5598cf07bce85997fFixed5c70eb5c593d64d93b178905da215a9fd288a4b5
Affected versions
v6.*
v6.1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.12.10
v6.12.11
v6.12.12
v6.12.13
v6.12.14
v6.12.15
v6.12.16
v6.12.17
v6.12.18
v6.12.19
v6.12.2
v6.12.20
v6.12.21
v6.12.22
v6.12.23
v6.12.24
v6.12.25
v6.12.26
v6.12.27
v6.12.28
v6.12.29
v6.12.3
v6.12.30
v6.12.31
v6.12.32
v6.12.33
v6.12.34
v6.12.35
v6.12.36
v6.12.37
v6.12.38
v6.12.39
v6.12.4
v6.12.40
v6.12.41
v6.12.42
v6.12.5
v6.12.6
v6.12.7
v6.12.8
v6.12.9
v6.13
v6.13-rc1
v6.13-rc2
v6.13-rc3
v6.13-rc4
v6.13-rc5
v6.13-rc6
v6.13-rc7
v6.13.1
v6.13.2
v6.13.3
v6.13.4
v6.13.5
v6.14-rc1
v6.14-rc2
v6.14-rc3
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.100
v6.6.101
v6.6.102
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.35
v6.6.36
v6.6.37
v6.6.38
v6.6.39
v6.6.4
v6.6.40
v6.6.41
v6.6.42
v6.6.43
v6.6.44
v6.6.45
v6.6.46
v6.6.47
v6.6.48
v6.6.49
v6.6.5
v6.6.50
v6.6.51
v6.6.52
v6.6.53
v6.6.54
v6.6.55
v6.6.56
v6.6.57
v6.6.58
v6.6.59
v6.6.6
v6.6.60
v6.6.61
v6.6.62
v6.6.63
v6.6.64
v6.6.65
v6.6.66
v6.6.67
v6.6.68
v6.6.69
v6.6.7
v6.6.70
v6.6.71
v6.6.72
v6.6.73
v6.6.74
v6.6.75
v6.6.76
v6.6.77
v6.6.78
v6.6.79
v6.6.8
v6.6.80
v6.6.81
v6.6.82
v6.6.83
v6.6.84
v6.6.85
v6.6.86
v6.6.87
v6.6.88
v6.6.89
v6.6.9
v6.6.90
v6.6.91
v6.6.92
v6.6.93
v6.6.94
v6.6.95
v6.6.96
v6.6.97
v6.6.98
v6.6.99
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
Database specific
vanir_signatures
[
{
"signature_type": "Function",
"target": {
"function": "smc_create_clcsk",
"file": "net/smc/af_smc.c"
},
"deprecated": false,
"digest": {
"function_hash": "256719362092566788276425534786176537353",
"length": 454.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@2668e038800b946d269f96ec1b258c01930a242c",
"signature_version": "v1",
"id": "CVE-2025-21884-008d2efd"
},
{
"signature_type": "Line",
"target": {
"file": "net/sunrpc/svcsock.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"307950930657288716725909654150840597519",
"136186424563951438989528421514442869757",
"51640694766348621686102104700545056467",
"32908006356526877743250698109337009304",
"205665512665232505152413767460040950131",
"192269166044464760472325615756760965929",
"12166910369276296911939358894367226412"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@2668e038800b946d269f96ec1b258c01930a242c",
"signature_version": "v1",
"id": "CVE-2025-21884-08ca0f86"
},
{
"signature_type": "Function",
"target": {
"function": "rds_tcp_tune",
"file": "net/rds/tcp.c"
},
"deprecated": false,
"digest": {
"function_hash": "12471898206548186134819899401200269678",
"length": 716.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@2668e038800b946d269f96ec1b258c01930a242c",
"signature_version": "v1",
"id": "CVE-2025-21884-0e33c484"
},
{
"signature_type": "Function",
"target": {
"function": "svc_create_socket",
"file": "net/sunrpc/svcsock.c"
},
"deprecated": false,
"digest": {
"function_hash": "286677212632872951560197876357152942406",
"length": 1491.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb",
"signature_version": "v1",
"id": "CVE-2025-21884-133b4069"
},
{
"signature_type": "Function",
"target": {
"function": "sk_clone_lock",
"file": "net/core/sock.c"
},
"deprecated": false,
"digest": {
"function_hash": "117130680780162225193399035711644006644",
"length": 2130.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c",
"signature_version": "v1",
"id": "CVE-2025-21884-1bce68e0"
},
{
"signature_type": "Function",
"target": {
"function": "__sk_destruct",
"file": "net/core/sock.c"
},
"deprecated": false,
"digest": {
"function_hash": "286644204726089909913475599740903795708",
"length": 936.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@5c70eb5c593d64d93b178905da215a9fd288a4b5",
"signature_version": "v1",
"id": "CVE-2025-21884-31aeedf4"
},
{
"signature_type": "Line",
"target": {
"file": "net/smc/af_smc.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"236088172862425845712261038674672433961",
"93265690075294321697964030767868789191",
"24677585738707729308791528382912308217",
"31089885083331397419270816813772655471",
"295700965112063947198303950396974521296",
"231546431655631528530927814820232830757",
"5736941706149015180614400848916853300"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@5c70eb5c593d64d93b178905da215a9fd288a4b5",
"signature_version": "v1",
"id": "CVE-2025-21884-34631f4f"
},
{
"signature_type": "Function",
"target": {
"function": "sk_alloc",
"file": "net/core/sock.c"
},
"deprecated": false,
"digest": {
"function_hash": "268086479889213382134793301030235073148",
"length": 766.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@5c70eb5c593d64d93b178905da215a9fd288a4b5",
"signature_version": "v1",
"id": "CVE-2025-21884-359277d5"
},
{
"signature_type": "Function",
"target": {
"function": "xs_create_sock",
"file": "net/sunrpc/xprtsock.c"
},
"deprecated": false,
"digest": {
"function_hash": "100070329339329902306656409033534547757",
"length": 897.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c",
"signature_version": "v1",
"id": "CVE-2025-21884-35b50cac"
},
{
"signature_type": "Line",
"target": {
"file": "net/netlink/af_netlink.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"141336215415985427734016960355479746479",
"284698883761470595656082495984271677578",
"108168907792882723527330016306636433050",
"158070046319867633673417613881372050119",
"95871390661071030785508175163908889282",
"230976925263260811306569555470003202071",
"105763296272034989838839795320660968169",
"130898485162419807463495087972094238877",
"159639124293868073661210403204473935677"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c",
"signature_version": "v1",
"id": "CVE-2025-21884-37cdb23b"
},
{
"signature_type": "Line",
"target": {
"file": "include/net/sock.h"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"249231734056517454551617276240424683651",
"164081775513012287067200994340799324248",
"193608209743662360576315878512019987359",
"225517772562865775334177086914545674423"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb",
"signature_version": "v1",
"id": "CVE-2025-21884-3a942ca3"
},
{
"signature_type": "Line",
"target": {
"file": "net/mptcp/subflow.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"127033756800017366486149552373676821492",
"24640663471665121914412586227080050090",
"171075180454151949623263463426137581699",
"108366913328043758091429369333516486572",
"326007615764622194519398332563504095301",
"310007677610885067521273830021915029320",
"174314602845949684153200731991087059400"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb",
"signature_version": "v1",
"id": "CVE-2025-21884-3b160212"
},
{
"signature_type": "Line",
"target": {
"file": "net/core/sock.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"305914535419521362942388380350548339241",
"112183131377298823644488762719601797481",
"254016745538726784614126042466544010217",
"106910148216479816936764481975338050127",
"200214550766112117586343300937445335561",
"268640561597700754230391443091738875289",
"285613745119146382207744623778780476340",
"49752502145978962804899181493858896412",
"83837747160789880859463550306523001052",
"9175882924778317619700504377094769719",
"39236133697239441990012506581497449408",
"29664592067419478409943695296059621364",
"329521414005833096548685179294250765202",
"214665848913796303109578709499776732306",
"133790807352223579723064732679869153348",
"82590907911107551587515541063833356835",
"149833827970674473693794682797080052324",
"115984482385050236160180700389393054800",
"221970316642980905389884593090578380499",
"36435985625445078065369023329184384490"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb",
"signature_version": "v1",
"id": "CVE-2025-21884-3cc92efa"
},
{
"signature_type": "Function",
"target": {
"function": "rds_tcp_tune",
"file": "net/rds/tcp.c"
},
"deprecated": false,
"digest": {
"function_hash": "12471898206548186134819899401200269678",
"length": 716.0
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@5c70eb5c593d64d93b178905da215a9fd288a4b5",
"signature_version": "v1",
"id": "CVE-2025-21884-3e3b3bcb"
},
{
"signature_type": "Line",
"target": {
"file": "net/netlink/af_netlink.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"141336215415985427734016960355479746479",
"284698883761470595656082495984271677578",
"108168907792882723527330016306636433050",
"158070046319867633673417613881372050119",
"95871390661071030785508175163908889282",
"230976925263260811306569555470003202071",
"105763296272034989838839795320660968169",
"130898485162419807463495087972094238877",
"159639124293868073661210403204473935677"
]
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ceb0bd4ffd009821b585ce6a8033b12b59fb5fb",
"signature_version": "v1",
"id": "CVE-2025-21884-49484307"
},
{
"signature_type": "Line",
"target": {
"file": "net/core/sock.c"
},
"deprecated": false,
"digest": {
"threshold": 0.9,
"line_hashes": [
"305914535419521362942388380350548339241",
"112183131377298823644488762719601797481",
"254016745538726784614126042466544010217",
"106910148216479816936764481975338050127",
"200214550766112117586343300937445335561",
"268640561597700754230391443091738875289",
"285613745119146382207744623778780476340",
"49752502145978962804899181493858896412",
"83837747160789880859463550306523001052",
"9175882924778317619700504377094769719",
"39236133697239441990012506581497449408",
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