CVE-2025-39909

DAMON's RECLAIM and LRU_SORT modules perform no validation on user-configured parameters during application, which may lead to division-by-zero errors.

Avoid the divide-by-zero by adding validation checks when DAMON modules attempt to apply the parameters.

This patch (of 2):

During the calculation of 'hotthres' and 'coldthres', either 'sampleinterval' or 'aggrinterval' is used as the divisor, which may lead to division-by-zero errors. Fix it by directly returning -EINVAL when such a case occurs. Additionally, since 'aggrinterval' is already required to be set no smaller than 'sampleinterval' in damonsetattrs(), only the case where 'sample_interval' is zero needs to be checked.

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

40e983cca9274e177bd5b9379299b44d9536ac68

Fixed

74e391f7da7d9d5235a3cca88ee9fc18f720c75b

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

40e983cca9274e177bd5b9379299b44d9536ac68

Fixed

7bb675c9f0257840d33e5d1337d7e3afdd74a6bf

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

40e983cca9274e177bd5b9379299b44d9536ac68

Fixed

af0ae62b935317bed1a1361c8c9579db9d300e70

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

40e983cca9274e177bd5b9379299b44d9536ac68

Fixed

326a4b3750c71af3f3c52399ec4dbe33b6da4c26

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

40e983cca9274e177bd5b9379299b44d9536ac68

Fixed

711f19dfd783ffb37ca4324388b9c4cb87e71363

Affected versions

v5.*

v5.19

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

v6.1.134

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

v6.1.146

v6.1.147

v6.1.148

v6.1.149

v6.1.15

v6.1.150

v6.1.151

v6.1.152

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

v6.12.36

v6.12.37

v6.12.38

v6.12.39

v6.12.4

v6.12.40

v6.12.41

v6.12.42

v6.12.43

v6.12.44

v6.12.45

v6.12.46

v6.12.47

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

v6.16

v6.16-rc1

v6.16-rc2

v6.16-rc3

v6.16-rc4

v6.16-rc5

v6.16-rc6

v6.16-rc7

v6.16.1

v6.16.2

v6.16.3

v6.16.4

v6.16.5

v6.16.6

v6.16.7

v6.17-rc1

v6.17-rc2

v6.17-rc3

v6.17-rc4

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

v6.6.103

v6.6.104

v6.6.105

v6.6.106

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

[
    {
        "deprecated": false,
        "target": {
            "file": "mm/damon/lru_sort.c"
        },
        "signature_type": "Line",
        "id": "CVE-2025-39909-0d08ad42",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "83663978343147728185198047237564254931",
                "46735116853786251715789582887914411799",
                "118272145479002426145335067721439654136"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@74e391f7da7d9d5235a3cca88ee9fc18f720c75b"
    },
    {
        "deprecated": false,
        "target": {
            "function": "damon_lru_sort_apply_parameters",
            "file": "mm/damon/lru_sort.c"
        },
        "signature_type": "Function",
        "id": "CVE-2025-39909-67095399",
        "signature_version": "v1",
        "digest": {
            "function_hash": "170074307495939660514723697900828157766",
            "length": 841.0
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@74e391f7da7d9d5235a3cca88ee9fc18f720c75b"
    },
    {
        "deprecated": false,
        "target": {
            "function": "damon_lru_sort_apply_parameters",
            "file": "mm/damon/lru_sort.c"
        },
        "signature_type": "Function",
        "id": "CVE-2025-39909-8f221704",
        "signature_version": "v1",
        "digest": {
            "function_hash": "170074307495939660514723697900828157766",
            "length": 841.0
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7bb675c9f0257840d33e5d1337d7e3afdd74a6bf"
    },
    {
        "deprecated": false,
        "target": {
            "file": "mm/damon/lru_sort.c"
        },
        "signature_type": "Line",
        "id": "CVE-2025-39909-910b49d6",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "83663978343147728185198047237564254931",
                "46735116853786251715789582887914411799",
                "118272145479002426145335067721439654136"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7bb675c9f0257840d33e5d1337d7e3afdd74a6bf"
    },
    {
        "deprecated": false,
        "target": {
            "file": "mm/damon/lru_sort.c"
        },
        "signature_type": "Line",
        "id": "CVE-2025-39909-b6a0c70d",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "295683988329300142447154091069696961218",
                "187768850950955958895683687716585784804",
                "235038582311232280772948221655855422945"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@af0ae62b935317bed1a1361c8c9579db9d300e70"
    },
    {
        "deprecated": false,
        "target": {
            "function": "damon_lru_sort_apply_parameters",
            "file": "mm/damon/lru_sort.c"
        },
        "signature_type": "Function",
        "id": "CVE-2025-39909-fba64bcc",
        "signature_version": "v1",
        "digest": {
            "function_hash": "81977551780018305934356595898055410413",
            "length": 760.0
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@af0ae62b935317bed1a1361c8c9579db9d300e70"
    }
]

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

6.0.0

Fixed

6.1.153

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.107

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.48

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.16.8