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Vulnerability record · CVE-2017-1000112 · published 5 October 2017

CVE-2017-1000112: Linux kernel race condition vulnerability

Linux · Linux Kernel

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.

7.0 CVSS 3.1 High EPSS 21% · top 2.5% CWE-362 · Race condition
7.0CVSS 3.1 base score, v2 6.9
21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
26References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://seclists.org/oss-sec/2017/q3/277 Mailing ListPatchThird Party Advisory
http://www.debian.org/security/2017/dsa-3981 Third Party Advisory
http://www.securityfocus.com/bid/100262 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039162 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:2918 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2930 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2931 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:3200 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1931 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1932 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4159 Third Party Advisory
https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112 Third Party Advisory
https://www.exploit-db.com/exploits/45147/ Third Party AdvisoryVDB Entry
http://seclists.org/oss-sec/2017/q3/277 Mailing ListPatchThird Party Advisory
http://www.debian.org/security/2017/dsa-3981 Third Party Advisory
http://www.securityfocus.com/bid/100262 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039162 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:2918 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2930 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2931 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:3200 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1931 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1932 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4159 Third Party Advisory
https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112 Third Party Advisory
https://www.exploit-db.com/exploits/45147/ Third Party AdvisoryVDB Entry

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Source: NIST National Vulnerability Database (record CVE-2017-1000112), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.