CVE-2022-49562

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Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49562
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49562.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-49562
Downstream
Related
Published
2025-02-26T02:14:06Z
Modified
2025-10-21T10:30:06.622216Z
Summary
KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Use _trycmpxchg_user() to update guest PTE A/D bits

Use the recently introduced _trycmpxchguser() to update guest PTE A/D bits instead of mapping the PTE into kernel address space. The VMPFNMAP path is broken as it assumes that vmpgoff is the base pfn of the mapped VMA range, which is conceptually wrong as vmpgoff is the offset relative to the file and has nothing to do with the pfn. The horrific hack worked for the original use case (backing guest memory with /dev/mem), but leads to accessing "random" pfns for pretty much any other VM_PFNMAP case.

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
bd53cb35a3e9adb73a834a36586e9ad80e877767
Fixed
38b888911e8dc89b89d8147cfb1d2dbe6373bf78
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
bd53cb35a3e9adb73a834a36586e9ad80e877767
Fixed
8089e5e1d18402fb8152d6b6815450a36fffa9b0
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
bd53cb35a3e9adb73a834a36586e9ad80e877767
Fixed
f122dfe4476890d60b8c679128cd2259ec96a24c

Affected versions

v5.*

v5.1
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.11
v5.11-rc1
v5.11-rc2
v5.11-rc3
v5.11-rc4
v5.11-rc5
v5.11-rc6
v5.11-rc7
v5.12
v5.12-rc1
v5.12-rc1-dontuse
v5.12-rc2
v5.12-rc3
v5.12-rc4
v5.12-rc5
v5.12-rc6
v5.12-rc7
v5.12-rc8
v5.13
v5.13-rc1
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
v5.17.1
v5.17.10
v5.17.11
v5.17.12
v5.17.2
v5.17.3
v5.17.4
v5.17.5
v5.17.6
v5.17.7
v5.17.8
v5.17.9
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.18.1
v5.2
v5.2-rc1
v5.2-rc2
v5.2-rc3
v5.2-rc4
v5.2-rc5
v5.2-rc6
v5.2-rc7
v5.3
v5.3-rc1
v5.3-rc2
v5.3-rc3
v5.3-rc4
v5.3-rc5
v5.3-rc6
v5.3-rc7
v5.3-rc8
v5.4
v5.4-rc1
v5.4-rc2
v5.4-rc3
v5.4-rc4
v5.4-rc5
v5.4-rc6
v5.4-rc7
v5.4-rc8
v5.5
v5.5-rc1
v5.5-rc2
v5.5-rc3
v5.5-rc4
v5.5-rc5
v5.5-rc6
v5.5-rc7
v5.6
v5.6-rc1
v5.6-rc2
v5.6-rc3
v5.6-rc4
v5.6-rc5
v5.6-rc6
v5.6-rc7
v5.7
v5.7-rc1
v5.7-rc2
v5.7-rc3
v5.7-rc4
v5.7-rc5
v5.7-rc6
v5.7-rc7
v5.8
v5.8-rc1
v5.8-rc2
v5.8-rc3
v5.8-rc4
v5.8-rc5
v5.8-rc6
v5.8-rc7
v5.9
v5.9-rc1
v5.9-rc2
v5.9-rc3
v5.9-rc4
v5.9-rc5
v5.9-rc6
v5.9-rc7
v5.9-rc8

Database specific

vanir_signatures

[
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8089e5e1d18402fb8152d6b6815450a36fffa9b0",
        "target": {
            "function": "(update_accessed_dirty_bits)",
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-0385ccf9",
        "digest": {
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            "function_hash": "247247453248252075775623958318122986024"
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        "signature_type": "Function"
    },
    {
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        "target": {
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-0f967e77",
        "digest": {
            "threshold": 0.9,
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        "target": {
            "function": "(cmpxchg_gpte)",
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-300aec47",
        "digest": {
            "length": 886.0,
            "function_hash": "335779025145623531677796799048128195931"
        },
        "signature_type": "Function"
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@38b888911e8dc89b89d8147cfb1d2dbe6373bf78",
        "target": {
            "function": "(update_accessed_dirty_bits)",
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-51cd5212",
        "digest": {
            "length": 1120.0,
            "function_hash": "247247453248252075775623958318122986024"
        },
        "signature_type": "Function"
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f122dfe4476890d60b8c679128cd2259ec96a24c",
        "target": {
            "function": "(cmpxchg_gpte)",
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-6c7261cb",
        "digest": {
            "length": 886.0,
            "function_hash": "335779025145623531677796799048128195931"
        },
        "signature_type": "Function"
    },
    {
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8089e5e1d18402fb8152d6b6815450a36fffa9b0",
        "target": {
            "function": "(cmpxchg_gpte)",
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-6cd07f95",
        "digest": {
            "length": 886.0,
            "function_hash": "335779025145623531677796799048128195931"
        },
        "signature_type": "Function"
    },
    {
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        "target": {
            "file": "arch/x86/kvm/mmu/paging_tmpl.h"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-b6e288b5",
        "digest": {
            "threshold": 0.9,
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        },
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        "signature_version": "v1",
        "id": "CVE-2022-49562-c9ebc546",
        "digest": {
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        "target": {
            "function": "(update_accessed_dirty_bits)",
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        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2022-49562-d799c7ac",
        "digest": {
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        },
        "signature_type": "Function"
    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.2.0
Fixed
5.17.13
Type
ECOSYSTEM
Events
Introduced
5.18.0
Fixed
5.18.2