CVE-2017-1000112 Memory corruption in n/a

What is CVE-2017-1000112?

CVE-2017-1000112 is a high-severity memory corruption vulnerability in Linux kernel, published on 4 Oct 2017. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2017-1000112?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2017-1000112?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2017-1000112 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-1000112 exists.

Public exploit code: 1 Metasploit module, 4 Exploit-DB entries and 5 proofs of concept on GitHub.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-1000112, GHSA-r7cm-47vv-77vj, RHSA-2019:1931, RHSA-2019:1932, SUSE-SU-2017:2423-1, SUSE-SU-2017:2424-1 and 31 more.