CVE-2017-1000112
Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 20.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 20.80% probability · 98th percentile
- Public exploits
- 3 in Exploit-DB · verified · first 13 August 2017
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- cve@mitre.org
EPSS 20.8% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (3)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
| EDB-ID | Title | Type | Published | Verified |
|---|---|---|---|---|
| EDB-47169source ↗ | Linux Kernel < 4.4.0/ < 4.8.0 (Ubuntu 14.04/16.04 / Linux Mint 17/18 / Zorin) - Local Privilege Escalation (KASLR / SMEP)linux · bcoles | local | 29 December 2018 | no |
| EDB-45147source ↗ | Linux Kernel - UDP Fragmentation Offset 'UFO' Privilege Escalation (Metasploit)linux · Metasploit | local | 3 August 2018 | yes |
| EDB-43418source ↗ | Linux Kernel < 4.4.0-83 / < 4.8.0-58 (Ubuntu 14.04/16.04) - Local Privilege Escalation (KASLR / SMEP)linux · Andrey Konovalov | local | 13 August 2017 | yes |
References
- http://seclists.org/oss-sec/2017/q3/277Mailing List, Patch, Third Party Advisory
- http://www.debian.org/security/2017/dsa-3981Third Party Advisory
- http://www.securityfocus.com/bid/100262Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039162Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2918Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2930Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3200Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1932Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4159Third Party Advisory
- https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112Third Party Advisory
- https://www.exploit-db.com/exploits/45147/Third Party Advisory, VDB Entry
- http://seclists.org/oss-sec/2017/q3/277Mailing List, Patch, Third Party Advisory
- http://www.debian.org/security/2017/dsa-3981Third Party Advisory
- http://www.securityfocus.com/bid/100262Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039162Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2918Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2930Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3200Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1931Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1932Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4159Third Party Advisory
- https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112Third Party Advisory
- https://www.exploit-db.com/exploits/45147/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.