{
    "id": "CVE-2017-1000112",
    "published": "2017-10-05 01:29:04",
    "last_modified": "2026-06-17 00:58:45",
    "cvss_score": "7.0",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-362",
    "description": "Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch. When building a UFO packet with MSG_MORE __ip_append_data() calls ip_ufo_append_data() to append. However in between two send() calls, the append path can be switched from UFO to non-UFO one, which leads to a memory corruption. In case UFO packet lengths exceeds MTU, copy = maxfraglen - skb->len becomes negative on the non-UFO path and the branch to allocate new skb is taken. This triggers fragmentation and computation of fraggap = skb_prev->len - maxfraglen. Fraggap can exceed MTU, causing copy = datalen - transhdrlen - fraggap to become negative. Subsequently skb_copy_and_csum_bits() writes out-of-bounds. A similar issue is present in IPv6 code. The bug was introduced in e89e9cf539a2 (\"[IPv4/IPv6]: UFO Scatter-gather approach\") on Oct 18 2005.",
    "epss_score": "0.20797",
    "epss_percentile": "0.97472",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-29 18:17:16",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "linux",
            "product": "linux_kernel"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "47169",
            "title": "Linux Kernel < 4.4.0/ < 4.8.0 (Ubuntu 14.04/16.04 / Linux Mint 17/18 / Zorin) - Local Privilege Escalation (KASLR / SMEP)",
            "date": "2018-12-29",
            "url": "https://www.exploit-db.com/exploits/47169"
        },
        {
            "source": "exploit-db",
            "ref_id": "45147",
            "title": "Linux Kernel - UDP Fragmentation Offset 'UFO' Privilege Escalation (Metasploit)",
            "date": "2018-08-03",
            "url": "https://www.exploit-db.com/exploits/45147"
        },
        {
            "source": "exploit-db",
            "ref_id": "43418",
            "title": "Linux Kernel < 4.4.0-83 / < 4.8.0-58 (Ubuntu 14.04/16.04) - Local Privilege Escalation (KASLR / SMEP)",
            "date": "2017-08-13",
            "url": "https://www.exploit-db.com/exploits/43418"
        }
    ],
    "refs_list": [
        "http://seclists.org/oss-sec/2017/q3/277",
        "http://www.debian.org/security/2017/dsa-3981",
        "http://www.securityfocus.com/bid/100262",
        "http://www.securitytracker.com/id/1039162",
        "https://access.redhat.com/errata/RHSA-2017:2918",
        "https://access.redhat.com/errata/RHSA-2017:2930",
        "https://access.redhat.com/errata/RHSA-2017:2931",
        "https://access.redhat.com/errata/RHSA-2017:3200",
        "https://access.redhat.com/errata/RHSA-2019:1931",
        "https://access.redhat.com/errata/RHSA-2019:1932",
        "https://access.redhat.com/errata/RHSA-2019:4159",
        "https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112",
        "https://www.exploit-db.com/exploits/45147/",
        "http://seclists.org/oss-sec/2017/q3/277",
        "http://www.debian.org/security/2017/dsa-3981",
        "http://www.securityfocus.com/bid/100262",
        "http://www.securitytracker.com/id/1039162",
        "https://access.redhat.com/errata/RHSA-2017:2918",
        "https://access.redhat.com/errata/RHSA-2017:2930",
        "https://access.redhat.com/errata/RHSA-2017:2931",
        "https://access.redhat.com/errata/RHSA-2017:3200",
        "https://access.redhat.com/errata/RHSA-2019:1931",
        "https://access.redhat.com/errata/RHSA-2019:1932",
        "https://access.redhat.com/errata/RHSA-2019:4159",
        "https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112"
    ]
}