CVE-2024-47717

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-47717
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47717.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-47717
Downstream
Related
Published
2024-10-21T11:53:48Z
Modified
2025-10-22T03:07:00.451262Z
Summary
RISC-V: KVM: Don't zero-out PMU snapshot area before freeing data
Details

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

RISC-V: KVM: Don't zero-out PMU snapshot area before freeing data

With the latest Linux-6.11-rc3, the below NULL pointer crash is observed when SBI PMU snapshot is enabled for the guest and the guest is forcefully powered-off.

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000508 Oops [#1] Modules linked in: kvm CPU: 0 UID: 0 PID: 61 Comm: term-poll Not tainted 6.11.0-rc3-00018-g44d7178dd77a #3 Hardware name: riscv-virtio,qemu (DT) epc : _kvmwriteguestpage+0x94/0xa6 [kvm] ra : _kvmwriteguestpage+0x54/0xa6 [kvm] epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0 gp : ffffffff81512a60 tp : ffffaf80024872c0 t0 : ffffaf800247e000 t1 : 00000000000007e0 t2 : 0000000000000000 s0 : ffff8f80001f39f0 s1 : 00007fff89ac4000 a0 : ffffffff015dd7e8 a1 : 0000000000000086 a2 : 0000000000000000 a3 : ffffaf8000000000 a4 : ffffaf80024882c0 a5 : 0000000000000000 a6 : ffffaf800328d780 a7 : 00000000000001cc s2 : ffffaf800197bd00 s3 : 00000000000828c4 s4 : ffffaf800248c000 s5 : ffffaf800247d000 s6 : 0000000000001000 s7 : 0000000000001000 s8 : 0000000000000000 s9 : 00007fff861fd500 s10: 0000000000000001 s11: 0000000000800000 t3 : 00000000000004d3 t4 : 00000000000004d3 t5 : ffffffff814126e0 t6 : ffffffff81412700 status: 0000000200000120 badaddr: 0000000000000508 cause: 000000000000000d [<ffffffff01590e98>] _kvmwriteguestpage+0x94/0xa6 [kvm] [<ffffffff015943a6>] kvmvcpuwriteguest+0x56/0x90 [kvm] [<ffffffff015a175c>] kvmpmuclearsnapshotarea+0x42/0x7e [kvm] [<ffffffff015a1972>] kvmriscvvcpupmudeinit.part.0+0xe0/0x14e [kvm] [<ffffffff015a2ad0>] kvmriscvvcpupmudeinit+0x1a/0x24 [kvm] [<ffffffff0159b344>] kvmarchvcpudestroy+0x28/0x4c [kvm] [<ffffffff0158e420>] kvmdestroyvcpus+0x5a/0xda [kvm] [<ffffffff0159930c>] kvmarchdestroyvm+0x14/0x28 [kvm] [<ffffffff01593260>] kvmdestroyvm+0x168/0x2a0 [kvm] [<ffffffff015933d4>] kvmputkvm+0x3c/0x58 [kvm] [<ffffffff01593412>] kvmvm_release+0x22/0x2e [kvm]

Clearly, the kvmvcpuwriteguest() function is crashing because it is being called from kvmpmuclearsnapshot_area() upon guest tear down.

To address the above issue, simplify the kvmpmuclearsnapshotarea() to not zero-out PMU snapshot area from kvmpmuclearsnapshotarea() because the guest is anyway being tore down.

The kvmpmuclearsnapshotarea() is also called when guest changes PMU snapshot area of a VCPU but even in this case the previous PMU snaphsot area must not be zeroed-out because the guest might have reclaimed the pervious PMU snapshot area for some other purpose.

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
c2f41ddbcdd75689d9f512638a40263e3127be93
Fixed
81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9a
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c2f41ddbcdd75689d9f512638a40263e3127be93
Fixed
6d0a5dcfc78bd18f2abb9641f83380135494559b
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c2f41ddbcdd75689d9f512638a40263e3127be93
Fixed
47d40d93292d9cff8dabb735bed83d930fa03950

Affected versions

v6.*

v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.10.1
v6.10.10
v6.10.11
v6.10.12
v6.10.2
v6.10.3
v6.10.4
v6.10.5
v6.10.6
v6.10.7
v6.10.8
v6.10.9
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.11.1
v6.9
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7

Database specific

vanir_signatures

[
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        "signature_type": "Function",
        "digest": {
            "function_hash": "74513715111347092663638866662921453106",
            "length": 423.0
        },
        "target": {
            "file": "arch/riscv/kvm/vcpu_pmu.c",
            "function": "kvm_pmu_clear_snapshot_area"
        },
        "signature_version": "v1",
        "id": "CVE-2024-47717-2cb09c2e",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9a"
    },
    {
        "signature_type": "Line",
        "digest": {
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        "target": {
            "file": "arch/riscv/kvm/vcpu_pmu.c"
        },
        "signature_version": "v1",
        "id": "CVE-2024-47717-4f737b3a",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@47d40d93292d9cff8dabb735bed83d930fa03950"
    },
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        "signature_type": "Function",
        "digest": {
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            "length": 423.0
        },
        "target": {
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            "function": "kvm_pmu_clear_snapshot_area"
        },
        "signature_version": "v1",
        "id": "CVE-2024-47717-a2cf953c",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@6d0a5dcfc78bd18f2abb9641f83380135494559b"
    },
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        "signature_type": "Line",
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        },
        "target": {
            "file": "arch/riscv/kvm/vcpu_pmu.c"
        },
        "signature_version": "v1",
        "id": "CVE-2024-47717-c1c74ffd",
        "deprecated": false,
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    },
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        "signature_type": "Line",
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        },
        "target": {
            "file": "arch/riscv/kvm/vcpu_pmu.c"
        },
        "signature_version": "v1",
        "id": "CVE-2024-47717-cf91fea9",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9a"
    },
    {
        "signature_type": "Function",
        "digest": {
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            "length": 423.0
        },
        "target": {
            "file": "arch/riscv/kvm/vcpu_pmu.c",
            "function": "kvm_pmu_clear_snapshot_area"
        },
        "signature_version": "v1",
        "id": "CVE-2024-47717-de3ed858",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@47d40d93292d9cff8dabb735bed83d930fa03950"
    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.10.0
Fixed
6.10.13
Type
ECOSYSTEM
Events
Introduced
6.11.0
Fixed
6.11.2