CVE-2025-21864

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Source
https://nvd.nist.gov/vuln/detail/CVE-2025-21864
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21864.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-21864
Downstream
Related
Published
2025-03-12T09:42:21.223Z
Modified
2025-11-20T08:51:02.906761Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
tcp: drop secpath at the same time as we currently drop dst
Details

In the Linux kernel, the following vulnerability has been resolved:

tcp: drop secpath at the same time as we currently drop dst

Xiumei reported hitting the WARN in xfrm6tunnelnet_exit while running tests that boil down to: - create a pair of netns - run a basic TCP test over ipcomp6 - delete the pair of netns

The xfrmstate found on spibyaddr was not deleted at the time we delete the netns, because we still have a reference on it. This lingering reference comes from a secpath (which holds a ref on the xfrmstate), which is still attached to an skb. This skb is not leaked, it ends up on skreceivequeue and then gets defer-free'd by skbattemptdeferfree.

The problem happens when we defer freeing an skb (push it on one CPU's deferlist), and don't flush that list before the netns is deleted. In that case, we still have a reference on the xfrmstate that we don't expect at this point.

We already drop the skb's dst in the TCP receive path when it's no longer needed, so let's also drop the secpath. At this point, tcp_filter has already called into the LSM hooks that may require the secpath, so it should not be needed anymore. However, in some of those places, the MPTCP extension has just been attached to the skb, so we cannot simply drop all extensions.

References

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
Introduced
68822bdf76f10c3dc80609d4e2cdc1e847429086
Fixed
87858bbf21da239ace300d61dd209907995c0491
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
68822bdf76f10c3dc80609d4e2cdc1e847429086
Fixed
f1d5e6a5e468308af7759cf5276779d3155c5e98
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
68822bdf76f10c3dc80609d4e2cdc1e847429086
Fixed
cd34a07f744451e2ecf9005bb7d24d0b2fb83656
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
68822bdf76f10c3dc80609d4e2cdc1e847429086
Fixed
69cafd9413084cd5012cf5d7c7ec6f3d493726d9
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
68822bdf76f10c3dc80609d4e2cdc1e847429086
Fixed
9b6412e6979f6f9e0632075f8f008937b5cd4efd

Affected versions

v5.*

v5.18
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8

v6.*

v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.1.1
v6.1.10
v6.1.100
v6.1.101
v6.1.102
v6.1.103
v6.1.104
v6.1.105
v6.1.106
v6.1.107
v6.1.108
v6.1.109
v6.1.11
v6.1.110
v6.1.111
v6.1.112
v6.1.113
v6.1.114
v6.1.115
v6.1.116
v6.1.117
v6.1.118
v6.1.119
v6.1.12
v6.1.120
v6.1.121
v6.1.122
v6.1.123
v6.1.124
v6.1.125
v6.1.126
v6.1.127
v6.1.128
v6.1.129
v6.1.13
v6.1.14
v6.1.15
v6.1.16
v6.1.17
v6.1.18
v6.1.19
v6.1.2
v6.1.20
v6.1.21
v6.1.22
v6.1.23
v6.1.24
v6.1.25
v6.1.26
v6.1.27
v6.1.28
v6.1.29
v6.1.3
v6.1.30
v6.1.31
v6.1.32
v6.1.33
v6.1.34
v6.1.35
v6.1.36
v6.1.37
v6.1.38
v6.1.39
v6.1.4
v6.1.40
v6.1.41
v6.1.42
v6.1.43
v6.1.44
v6.1.45
v6.1.46
v6.1.47
v6.1.48
v6.1.49
v6.1.5
v6.1.50
v6.1.51
v6.1.52
v6.1.53
v6.1.54
v6.1.55
v6.1.56
v6.1.57
v6.1.58
v6.1.59
v6.1.6
v6.1.60
v6.1.61
v6.1.62
v6.1.63
v6.1.64
v6.1.65
v6.1.66
v6.1.67
v6.1.68
v6.1.69
v6.1.7
v6.1.70
v6.1.71
v6.1.72
v6.1.73
v6.1.74
v6.1.75
v6.1.76
v6.1.77
v6.1.78
v6.1.79
v6.1.8
v6.1.80
v6.1.81
v6.1.82
v6.1.83
v6.1.84
v6.1.85
v6.1.86
v6.1.87
v6.1.88
v6.1.89
v6.1.9
v6.1.90
v6.1.91
v6.1.92
v6.1.93
v6.1.94
v6.1.95
v6.1.96
v6.1.97
v6.1.98
v6.1.99
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
v6.12.2
v6.12.3
v6.12.4
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
v6.14-rc1
v6.14-rc2
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
v6.6.11
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
v6.6.9
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

[
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_ipv4.c"
        },
        "digest": {
            "threshold": 0.9,
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                "326803920925431319361769260137653812960"
            ]
        },
        "id": "CVE-2025-21864-1e1549f7",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cd34a07f744451e2ecf9005bb7d24d0b2fb83656",
        "signature_version": "v1"
    },
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                "326803920925431319361769260137653812960"
            ]
        },
        "id": "CVE-2025-21864-2a33a66d",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@87858bbf21da239ace300d61dd209907995c0491",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_fastopen.c"
        },
        "digest": {
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            "line_hashes": [
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                "232618876156787130859432253302904645432"
            ]
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        "id": "CVE-2025-21864-2df14711",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f1d5e6a5e468308af7759cf5276779d3155c5e98",
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    },
    {
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        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@69cafd9413084cd5012cf5d7c7ec6f3d493726d9",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_fastopen.c",
            "function": "tcp_fastopen_add_skb"
        },
        "digest": {
            "length": 718.0,
            "function_hash": "129639135005446605019083059988149824768"
        },
        "id": "CVE-2025-21864-352ef8bf",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f1d5e6a5e468308af7759cf5276779d3155c5e98",
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    },
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            "function": "tcp_fastopen_add_skb"
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        "digest": {
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            "function_hash": "129639135005446605019083059988149824768"
        },
        "id": "CVE-2025-21864-3542c8f3",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@87858bbf21da239ace300d61dd209907995c0491",
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        },
        "id": "CVE-2025-21864-3e432987",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cd34a07f744451e2ecf9005bb7d24d0b2fb83656",
        "signature_version": "v1"
    },
    {
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        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_queue_rcv"
        },
        "digest": {
            "length": 388.0,
            "function_hash": "31538387340150128950981280239991607161"
        },
        "id": "CVE-2025-21864-42300265",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cd34a07f744451e2ecf9005bb7d24d0b2fb83656",
        "signature_version": "v1"
    },
    {
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        },
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        },
        "id": "CVE-2025-21864-46c562b8",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f1d5e6a5e468308af7759cf5276779d3155c5e98",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_ofo_queue"
        },
        "digest": {
            "length": 1134.0,
            "function_hash": "81607696785254007220516415021582162728"
        },
        "id": "CVE-2025-21864-4a2973e6",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@69cafd9413084cd5012cf5d7c7ec6f3d493726d9",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_ofo_queue"
        },
        "digest": {
            "length": 1134.0,
            "function_hash": "81607696785254007220516415021582162728"
        },
        "id": "CVE-2025-21864-4a83cd3c",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f1d5e6a5e468308af7759cf5276779d3155c5e98",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_fastopen.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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                "232618876156787130859432253302904645432"
            ]
        },
        "id": "CVE-2025-21864-4eb33078",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@87858bbf21da239ace300d61dd209907995c0491",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_queue_rcv"
        },
        "digest": {
            "length": 388.0,
            "function_hash": "31538387340150128950981280239991607161"
        },
        "id": "CVE-2025-21864-5ecb29f4",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f1d5e6a5e468308af7759cf5276779d3155c5e98",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_ofo_queue"
        },
        "digest": {
            "length": 1134.0,
            "function_hash": "81607696785254007220516415021582162728"
        },
        "id": "CVE-2025-21864-6c254bb8",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cd34a07f744451e2ecf9005bb7d24d0b2fb83656",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_queue_rcv"
        },
        "digest": {
            "length": 388.0,
            "function_hash": "31538387340150128950981280239991607161"
        },
        "id": "CVE-2025-21864-75dc5c1d",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@87858bbf21da239ace300d61dd209907995c0491",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
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        "digest": {
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        "digest": {
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        "id": "CVE-2025-21864-a77deca4",
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            "function": "tcp_fastopen_add_skb"
        },
        "digest": {
            "length": 718.0,
            "function_hash": "129639135005446605019083059988149824768"
        },
        "id": "CVE-2025-21864-b11745b0",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@69cafd9413084cd5012cf5d7c7ec6f3d493726d9",
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                "296430841605372565549063276164660419030"
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        "id": "CVE-2025-21864-b61c55c3",
        "signature_type": "Line",
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                "232618876156787130859432253302904645432"
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        },
        "id": "CVE-2025-21864-bebebd8d",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@69cafd9413084cd5012cf5d7c7ec6f3d493726d9",
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        "id": "CVE-2025-21864-cdc8e35b",
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    {
        "deprecated": false,
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        "id": "CVE-2025-21864-d1dd9ae8",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@69cafd9413084cd5012cf5d7c7ec6f3d493726d9",
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        "deprecated": false,
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        "id": "CVE-2025-21864-d262850b",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f1d5e6a5e468308af7759cf5276779d3155c5e98",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "target": {
            "file": "net/ipv4/tcp_input.c",
            "function": "tcp_ofo_queue"
        },
        "digest": {
            "length": 1134.0,
            "function_hash": "81607696785254007220516415021582162728"
        },
        "id": "CVE-2025-21864-dabc71dd",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@87858bbf21da239ace300d61dd209907995c0491",
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        "deprecated": false,
        "target": {
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            "function": "tcp_fastopen_add_skb"
        },
        "digest": {
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            "function_hash": "129639135005446605019083059988149824768"
        },
        "id": "CVE-2025-21864-eb14faee",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cd34a07f744451e2ecf9005bb7d24d0b2fb83656",
        "signature_version": "v1"
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    {
        "deprecated": false,
        "target": {
            "file": "include/net/tcp.h"
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        "digest": {
            "threshold": 0.9,
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        "id": "CVE-2025-21864-ed7c88f7",
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            "file": "net/ipv4/tcp_input.c"
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                "297491708066274046052878626230607106802",
                "298638686706315759217888366905330734911"
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        "id": "CVE-2025-21864-eda2df38",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cd34a07f744451e2ecf9005bb7d24d0b2fb83656",
        "signature_version": "v1"
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                "69050883589279645114537393322096091916",
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                "282767166511907239808423150227893838305",
                "126795519571985503943592321861907017251",
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                "297491708066274046052878626230607106802",
                "298638686706315759217888366905330734911"
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        },
        "id": "CVE-2025-21864-fb6709a8",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@87858bbf21da239ace300d61dd209907995c0491",
        "signature_version": "v1"
    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.19.0
Fixed
6.1.130
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.80
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.17
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.13.5