CVE-2025-38364

Temporarily clear the preallocation flag when explicitly requesting allocations. Pre-existing allocations are already counted against the request through masnodecountgfp(), but the allocations will not happen if the MASTATE_PREALLOC flag is set. This flag is meant to avoid re-allocating in bulk allocation mode, and to detect issues with preallocation calculations.

The MASTATEPREALLOC flag should also always be set on zero allocations so that detection of underflow allocations will print a WARN_ON() during consumption.

User visible effect of this flaw is a WARNON() followed by a null pointer dereference when subsequent requests for larger number of nodes is ignored, such as the vma merge retry in mmapregion() caused by drivers altering the vma flags (which happens in v6.6, at least)

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

54a611b605901c7d5d05b6b8f5d04a6ceb0962aa

Fixed

d69cd64bd5af41c6fd409313504089970edaf02f

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

54a611b605901c7d5d05b6b8f5d04a6ceb0962aa

Fixed

e63032e66bca1d06e600033f3369ba3db3af0870

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

54a611b605901c7d5d05b6b8f5d04a6ceb0962aa

Fixed

cf95f8426f889949b738f51ffcd72884411f3a6a

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

54a611b605901c7d5d05b6b8f5d04a6ceb0962aa

Fixed

9e32f4700867abbd5d19abfcf698dbd0d2ce36a4

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

54a611b605901c7d5d05b6b8f5d04a6ceb0962aa

Fixed

fba46a5d83ca8decb338722fb4899026d8d9ead2

Affected versions

v6.*

v6.0

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

v6.1.134

v6.1.135

v6.1.136

v6.1.137

v6.1.138

v6.1.139

v6.1.14

v6.1.140

v6.1.141

v6.1.142

v6.1.143

v6.1.144

v6.1.145

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

v6.12.23

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

v6.12.4

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

v6.14

v6.14-rc1

v6.14-rc2

v6.14-rc3

v6.14-rc4

v6.14-rc5

v6.14-rc6

v6.14-rc7

v6.15

v6.15-rc1

v6.15-rc2

v6.15-rc3

v6.15-rc4

v6.15-rc5

v6.15-rc6

v6.15-rc7

v6.15.1

v6.15.2

v6.15.3

v6.15.4

v6.16-rc1

v6.16-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

v6.6.80

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

v6.7

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

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            "threshold": 0.9
        },
        "target": {
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        "id": "CVE-2025-38364-1916a987",
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        "digest": {
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            "length": 1273.0
        },
        "target": {
            "function": "mas_preallocate",
            "file": "lib/maple_tree.c"
        },
        "id": "CVE-2025-38364-54d211af",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e63032e66bca1d06e600033f3369ba3db3af0870",
        "signature_type": "Function"
    },
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        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "function_hash": "274955470403236226385647696870955546610",
            "length": 501.0
        },
        "target": {
            "function": "mas_preallocate",
            "file": "lib/maple_tree.c"
        },
        "id": "CVE-2025-38364-55cf3672",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fba46a5d83ca8decb338722fb4899026d8d9ead2",
        "signature_type": "Function"
    },
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        "deprecated": false,
        "signature_version": "v1",
        "digest": {
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        },
        "target": {
            "file": "lib/maple_tree.c"
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        "id": "CVE-2025-38364-5f0b36ce",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9e32f4700867abbd5d19abfcf698dbd0d2ce36a4",
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        "signature_version": "v1",
        "digest": {
            "function_hash": "6702581905321453572417039609997513480",
            "length": 366.0
        },
        "target": {
            "function": "mas_preallocate",
            "file": "lib/maple_tree.c"
        },
        "id": "CVE-2025-38364-65cc39c6",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d69cd64bd5af41c6fd409313504089970edaf02f",
        "signature_type": "Function"
    },
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        "deprecated": false,
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        "digest": {
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            "threshold": 0.9
        },
        "target": {
            "file": "lib/maple_tree.c"
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        "id": "CVE-2025-38364-72e7d1fa",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fba46a5d83ca8decb338722fb4899026d8d9ead2",
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        "digest": {
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            "threshold": 0.9
        },
        "target": {
            "file": "lib/maple_tree.c"
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        "id": "CVE-2025-38364-929263cb",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cf95f8426f889949b738f51ffcd72884411f3a6a",
        "signature_type": "Line"
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    {
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        "digest": {
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            "threshold": 0.9
        },
        "target": {
            "file": "lib/maple_tree.c"
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        "id": "CVE-2025-38364-d3caede5",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e63032e66bca1d06e600033f3369ba3db3af0870",
        "signature_type": "Line"
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    {
        "deprecated": false,
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        "digest": {
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            "length": 498.0
        },
        "target": {
            "function": "mas_preallocate",
            "file": "lib/maple_tree.c"
        },
        "id": "CVE-2025-38364-f935c938",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9e32f4700867abbd5d19abfcf698dbd0d2ce36a4",
        "signature_type": "Function"
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
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            "length": 476.0
        },
        "target": {
            "function": "mas_preallocate",
            "file": "lib/maple_tree.c"
        },
        "id": "CVE-2025-38364-feaeb52c",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cf95f8426f889949b738f51ffcd72884411f3a6a",
        "signature_type": "Function"
    }
]

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

6.1.0

Fixed

6.1.146

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.99

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.36

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.15.5