CVE-2023-3439

A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.

Database specific

{
    "cna_assigner": "fedora",
    "cwe_ids": [
        "CWE-416"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/3xxx/CVE-2023-3439.json"
}

References

Affected packages

Git / github.com/torvalds/linux

Affected ranges

Type

GIT

Repo

https://github.com/torvalds/linux

Events

Introduced

672c0c5173427e6b3e2a9bbb7be51ceeec78093a

Fixed

b561275d633bcd8e0e8055ab86f1a13df75a0269

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "Fixed in kernel 5.18-rc5"
                },
                {
                    "last_affected": "Fixed in kernel 5.18-rc5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "fixed": "b561275d633bcd8e0e8055ab86f1a13df75a0269"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

Fixed in kernel 5.*

Fixed in kernel 5.18-rc5

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-3439.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "168981815878191031903153916587435271215",
                "314400666070469714366690387433676997929",
                "277047898933548389798896890194035779282",
                "33190241435655553803280417495093873925",
                "229037915747012857161483992790387446839",
                "154872401689107678766388791766433321640",
                "83689756520528807844564534226800045916",
                "15422588019133131261137424246736428133"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2023-3439-bf3dd028",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269",
        "target": {
            "file": "net/mctp/device.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "243811863569125915548437023478063573517",
            "length": 379
        },
        "id": "CVE-2023-3439-cfc6ccc8",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269",
        "target": {
            "file": "net/mctp/device.c",
            "function": "mctp_unregister"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "39706822095234289063947371467703032029",
            "length": 140
        },
        "id": "CVE-2023-3439-e75feec0",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269",
        "target": {
            "file": "net/mctp/device.c",
            "function": "mctp_dev_put"
        }
    }
]

vanir_signatures_modified

"2026-10-22T15:54:34Z"