CVE-2025-21978

When a Hyper-V DRM device is probed, the driver allocates MMIO space for the vram, and maps it cacheable. If the device removed, or in the error path for device probing, the MMIO space is released but no unmap is done. Consequently the kernel address space for the mapping is leaked.

Fix this by adding iounmap() calls in the device removal path, and in the error path during device probing.

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

a0ab5abced550ddeefddb06055ed60779a54eb79

Fixed

c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1e

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

a0ab5abced550ddeefddb06055ed60779a54eb79

Fixed

ad27b4a51495490b815580d9b935e8eee14d1a9c

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

a0ab5abced550ddeefddb06055ed60779a54eb79

Fixed

24f1bbfb2be77dad82489c1468bbb14312aab129

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

a0ab5abced550ddeefddb06055ed60779a54eb79

Fixed

158242b56bf465a73e1edeac0fe828a8acad4499

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

a0ab5abced550ddeefddb06055ed60779a54eb79

Fixed

aed709355fd05ef747e1af24a1d5d78cd7feb81e

Affected versions

v5.*

v5.18

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

v6.1.14

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

v6.12.3

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

v6.13.5

v6.13.6

v6.13.7

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

v6.6.80

v6.6.81

v6.6.82

v6.6.83

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

[
    {
        "id": "CVE-2025-21978-013b4b92",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
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        "deprecated": false,
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        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c"
        }
    },
    {
        "id": "CVE-2025-21978-39f5f9b7",
        "signature_version": "v1",
        "digest": {
            "function_hash": "16618564796517622469671994865513785886",
            "length": 1069.0
        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@158242b56bf465a73e1edeac0fe828a8acad4499",
        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c",
            "function": "hyperv_vmbus_probe"
        }
    },
    {
        "id": "CVE-2025-21978-50388d96",
        "signature_version": "v1",
        "digest": {
            "function_hash": "16618564796517622469671994865513785886",
            "length": 1069.0
        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@aed709355fd05ef747e1af24a1d5d78cd7feb81e",
        "target": {
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            "function": "hyperv_vmbus_probe"
        }
    },
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            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c"
        }
    },
    {
        "id": "CVE-2025-21978-81630fec",
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        "digest": {
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        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1e",
        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c",
            "function": "hyperv_vmbus_remove"
        }
    },
    {
        "id": "CVE-2025-21978-8a60918e",
        "signature_version": "v1",
        "digest": {
            "function_hash": "16094940995440498826267425914168205818",
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        },
        "deprecated": false,
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        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c",
            "function": "hyperv_vmbus_remove"
        }
    },
    {
        "id": "CVE-2025-21978-aead54f6",
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        "digest": {
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        "deprecated": false,
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@aed709355fd05ef747e1af24a1d5d78cd7feb81e",
        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c"
        }
    },
    {
        "id": "CVE-2025-21978-e29d5b1c",
        "signature_version": "v1",
        "digest": {
            "function_hash": "309782077057342586402814175656021249640",
            "length": 1030.0
        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1e",
        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c",
            "function": "hyperv_vmbus_probe"
        }
    },
    {
        "id": "CVE-2025-21978-f0ba946c",
        "signature_version": "v1",
        "digest": {
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            "length": 261.0
        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@158242b56bf465a73e1edeac0fe828a8acad4499",
        "target": {
            "file": "drivers/gpu/drm/hyperv/hyperv_drm_drv.c",
            "function": "hyperv_vmbus_remove"
        }
    }
]

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

6.0.0

Fixed

6.1.132

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.84

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.20

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.13.8