CVE-2025-22040

There is a race condition between session setup and ksmbdsessionsderegister. The session can be freed before the connection is added to channel list of session. This patch check reference count of session before freeing it.

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

0626e6641f6b467447c81dd7678a69c66f7746cf

Fixed

596407adb9af1ee75fe7c7529607783d31b66e7f

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

0626e6641f6b467447c81dd7678a69c66f7746cf

Fixed

3980770cb1470054e6400fd97668665975726737

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

0626e6641f6b467447c81dd7678a69c66f7746cf

Fixed

9069939d762138e232a6f79e3e1462682ed6a17d

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

0626e6641f6b467447c81dd7678a69c66f7746cf

Fixed

94c281721d4ed2d972232414b91d98a6f5bdb16b

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

0626e6641f6b467447c81dd7678a69c66f7746cf

Fixed

7dfbd4c43eed91dd2548a95236908025707a8dfd

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

0626e6641f6b467447c81dd7678a69c66f7746cf

Fixed

fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db

Affected versions

v5.*

v5.13

v5.13-rc2

v5.13-rc3

v5.13-rc4

v5.13-rc5

v5.13-rc6

v5.13-rc7

v5.14

v5.14-rc1

v5.14-rc2

v5.14-rc3

v5.14-rc4

v5.14-rc5

v5.14-rc6

v5.14-rc7

v5.15

v5.15-rc1

v5.15-rc2

v5.15-rc3

v5.15-rc4

v5.15-rc5

v5.15-rc6

v5.15-rc7

v5.16

v5.16-rc1

v5.16-rc2

v5.16-rc3

v5.16-rc4

v5.16-rc5

v5.16-rc6

v5.16-rc7

v5.16-rc8

v5.17

v5.17-rc1

v5.17-rc2

v5.17-rc3

v5.17-rc4

v5.17-rc5

v5.17-rc6

v5.17-rc7

v5.17-rc8

v5.18

v5.18-rc1

v5.18-rc2

v5.18-rc3

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

v6.1.130

v6.1.131

v6.1.132

v6.1.133

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

v6.12.17

v6.12.18

v6.12.19

v6.12.2

v6.12.20

v6.12.21

v6.12.22

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

v6.13.10

v6.13.2

v6.13.3

v6.13.4

v6.13.5

v6.13.6

v6.13.7

v6.13.8

v6.13.9

v6.14

v6.14-rc1

v6.14-rc2

v6.14-rc3

v6.14-rc4

v6.14-rc5

v6.14-rc6

v6.14-rc7

v6.14.1

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

v6.6.80

v6.6.81

v6.6.82

v6.6.83

v6.6.84

v6.6.85

v6.6.86

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

[
    {
        "target": {
            "function": "ksmbd_get_encryption_key",
            "file": "fs/smb/server/auth.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 390.0,
            "function_hash": "8344273652643831530029466330494423027"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@596407adb9af1ee75fe7c7529607783d31b66e7f",
        "deprecated": false,
        "id": "CVE-2025-22040-09a19d0f",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "__session_create",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 848.0,
            "function_hash": "200288829209072472897586648455045691052"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@596407adb9af1ee75fe7c7529607783d31b66e7f",
        "deprecated": false,
        "id": "CVE-2025-22040-18aeda33",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "ksmbd_get_encryption_key",
            "file": "fs/smb/server/auth.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 390.0,
            "function_hash": "8344273652643831530029466330494423027"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9069939d762138e232a6f79e3e1462682ed6a17d",
        "deprecated": false,
        "id": "CVE-2025-22040-1a074dba",
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "fs/smb/server/smb2pdu.c"
        },
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "32986375113771053384565262391352040115",
                "133500095050618697166014871206026598645",
                "213864715678198378593634674488094462881",
                "155043829247961093187574562285537047804",
                "305801919864878748110182329029460534095",
                "218614510374021481309774167328177229104",
                "80318771853422501900431332083941289447",
                "205105672161166281711681874074027823588",
                "135403823235433514353934721773515068886"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@596407adb9af1ee75fe7c7529607783d31b66e7f",
        "deprecated": false,
        "id": "CVE-2025-22040-271b14c9",
        "signature_type": "Line"
    },
    {
        "target": {
            "file": "fs/smb/server/smb2pdu.c"
        },
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "32986375113771053384565262391352040115",
                "133500095050618697166014871206026598645",
                "213864715678198378593634674488094462881",
                "155043829247961093187574562285537047804",
                "305801919864878748110182329029460534095",
                "218614510374021481309774167328177229104",
                "80318771853422501900431332083941289447",
                "205105672161166281711681874074027823588",
                "135403823235433514353934721773515068886"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "deprecated": false,
        "id": "CVE-2025-22040-3cff3207",
        "signature_type": "Line"
    },
    {
        "target": {
            "function": "ksmbd_user_session_put",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 158.0,
            "function_hash": "230738801622218840480902579797880926058"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@596407adb9af1ee75fe7c7529607783d31b66e7f",
        "deprecated": false,
        "id": "CVE-2025-22040-3fa96c01",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "ksmbd_expire_session",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 545.0,
            "function_hash": "15735926891641915695073325425529733065"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9069939d762138e232a6f79e3e1462682ed6a17d",
        "deprecated": false,
        "id": "CVE-2025-22040-556f4337",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "__session_create",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 855.0,
            "function_hash": "167208171048216139609908392620312528773"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "deprecated": false,
        "id": "CVE-2025-22040-75cba7bc",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "ksmbd_get_encryption_key",
            "file": "fs/smb/server/auth.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 390.0,
            "function_hash": "8344273652643831530029466330494423027"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "deprecated": false,
        "id": "CVE-2025-22040-7c62dade",
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "69306527568464203111015498776592159788",
                "103456333058355031632028830965584930286",
                "258662312134689784009942387240243664744",
                "214879352658422331327344731089669227707",
                "9003713685494993070105802034056920355",
                "98396065550206329542336110557132006748",
                "169653144589724833419827295017812863656",
                "250594591575556118992363477885586059022",
                "169208010284428250103281147987085406290",
                "92329924828284323760970241437446540977",
                "248030424898210743201626882991285662855",
                "194104704409079374782565112865381722540",
                "205561808285924563963846571528883951146",
                "242634807293929121754212788787302221498",
                "253639847905462943862563978187305835675",
                "75565439008793244010951358732493697374",
                "27455778924732423827179690881918820157",
                "3817666327037762396751839760473615219",
                "199216227384590854306177155483762412580",
                "334933167003035897665585737324851716049",
                "73920344939840612172445649660365306991"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "deprecated": false,
        "id": "CVE-2025-22040-800eeb25",
        "signature_type": "Line"
    },
    {
        "target": {
            "function": "ksmbd_expire_session",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 545.0,
            "function_hash": "15735926891641915695073325425529733065"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "deprecated": false,
        "id": "CVE-2025-22040-8503eca0",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "smb2_session_logoff",
            "file": "fs/smb/server/smb2pdu.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 1164.0,
            "function_hash": "111559200347761131563693991666113790700"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9069939d762138e232a6f79e3e1462682ed6a17d",
        "deprecated": false,
        "id": "CVE-2025-22040-8e462ce6",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "ksmbd_user_session_put",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 158.0,
            "function_hash": "230738801622218840480902579797880926058"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "deprecated": false,
        "id": "CVE-2025-22040-8ee864c9",
        "signature_type": "Function"
    },
    {
        "target": {
            "function": "ksmbd_expire_session",
            "file": "fs/smb/server/mgmt/user_session.c"
        },
        "signature_version": "v1",
        "digest": {
            "length": 545.0,
            "function_hash": "15735926891641915695073325425529733065"
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@596407adb9af1ee75fe7c7529607783d31b66e7f",
        "deprecated": false,
        "id": "CVE-2025-22040-8f02fe5e",
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "fs/smb/server/auth.c"
        },
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "194575867943969363267765305471047492601",
                "188326687689108320081362374014091390149",
                "127286446623890652691201339660231460173",
                "47793882480167725894067058763154775694",
                "120455018495495458239410624320725146085",
                "314831660497774791760291421804512233316"
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]

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

5.15.0

Fixed

6.1.134

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.87

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.23

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.13.11

Type: ECOSYSTEM
Events: Introduced

6.14.0

Fixed

6.14.2