The tcpmssmanglepacket function in net/netfilter/xtTCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xtTCPMSS in an iptables action.
[
    {
        "id": "CVE-2017-18017-67aac2b8",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Function",
        "target": {
            "file": "net/netfilter/xt_TCPMSS.c",
            "function": "tcpmss_mangle_packet"
        },
        "digest": {
            "function_hash": "258529677211135581736056381308471737043",
            "length": 2288.0
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git@2638fd0f92d4397884fd991d8f4925cb3f081901"
    },
    {
        "id": "CVE-2017-18017-eea7e029",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Line",
        "target": {
            "file": "net/netfilter/xt_TCPMSS.c"
        },
        "digest": {
            "line_hashes": [
                "162258670710416702997586488041210628232",
                "148964180394642854167106965748630098256",
                "15984514308700478718840847737910083897",
                "232735794523049691887418241897364459863",
                "324155596358226543237301865408864531656",
                "230697090639336258677461166945617381557",
                "333144358156474064786568956147931082934"
            ],
            "threshold": 0.9
        },
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git@2638fd0f92d4397884fd991d8f4925cb3f081901"
    }
]
                          [
    {
        "id": "CVE-2017-18017-54b595aa",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Line",
        "target": {
            "file": "net/netfilter/xt_TCPMSS.c"
        },
        "digest": {
            "line_hashes": [
                "162258670710416702997586488041210628232",
                "148964180394642854167106965748630098256",
                "15984514308700478718840847737910083897",
                "232735794523049691887418241897364459863",
                "324155596358226543237301865408864531656",
                "230697090639336258677461166945617381557",
                "333144358156474064786568956147931082934"
            ],
            "threshold": 0.9
        },
        "source": "https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901"
    },
    {
        "id": "CVE-2017-18017-b06ea2bf",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Function",
        "target": {
            "file": "net/netfilter/xt_TCPMSS.c",
            "function": "tcpmss_mangle_packet"
        },
        "digest": {
            "function_hash": "258529677211135581736056381308471737043",
            "length": 2288.0
        },
        "source": "https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901"
    }
]