ASB-A-213339151

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Import Source
https://storage.googleapis.com/android-osv/ASB-A-213339151.json
JSON Data
https://api.osv.dev/v1/vulns/ASB-A-213339151
Aliases
  • A-213339151
  • CVE-2021-39802
Published
2022-04-01T00:00:00Z
Modified
2026-07-06T16:05:37.125561726Z
Summary
[none]
Details

In changepterange of mprotect.c , there is a possible way to make a shared mmap writable due to a permissions bypass. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

References

Affected packages

Android / :linux_kernel:

Package

Name
:linux_kernel:

Affected ranges

Type
ECOSYSTEM
Events
Introduced
:0
Fixed
:2022-04-05

Affected versions

Other
Kernel

Ecosystem specific 

{
    "vanir_signatures": [
        {
            "id": "ASB-A-213339151-233930ca",
            "target": {
                "file": "mm/mprotect.c"
            },
            "signature_version": "v1",
            "source": "https://android.googlesource.com/kernel/common/+/ac4488815518c",
            "signature_type": "Line",
            "digest": {
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            "id": "ASB-A-213339151-40f58064",
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                "file": "mm/mprotect.c"
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            "id": "ASB-A-213339151-453c7d84",
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            "source": "https://android.googlesource.com/kernel/common/+/6f9aba5a20b84",
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            "deprecated": true
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        {
            "digest": {
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            "target": {
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            "signature_version": "v1",
            "source": "https://android.googlesource.com/kernel/common/+/ac4488815518c",
            "signature_type": "Function",
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            "target": {
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            },
            "signature_version": "v1",
            "source": "https://android.googlesource.com/kernel/common/+/b44e46bb047d1",
            "signature_type": "Line",
            "digest": {
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            "deprecated": true
        },
        {
            "id": "ASB-A-213339151-f3d50201",
            "target": {
                "function": "change_pte_range",
                "file": "mm/mprotect.c"
            },
            "signature_version": "v1",
            "source": "https://android.googlesource.com/kernel/common/+/b44e46bb047d1",
            "signature_type": "Function",
            "digest": {
                "function_hash": "172667158180238430828807650673675159960",
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    ],
    "fixes": [
        "https://android.googlesource.com/kernel/common/+/ac4488815518c",
        "https://android.googlesource.com/kernel/common/+/b44e46bb047d1",
        "https://android.googlesource.com/kernel/common/+/67d075d23a8bc",
        "https://android.googlesource.com/kernel/common/+/6f9aba5a20b84"
    ],
    "types": [
        "EoP"
    ],
    "spl": "2022-04-05",
    "severity": "High"
}

Database specific

source 
"https://storage.googleapis.com/android-osv/ASB-A-213339151.json"