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CVE-2017-1000112· NVD / CVE Program· CNA mitre

Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch.

Noroxi assessment

Priority: Monitor (action score 34/100)

  • A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 20.7% (FIRST EPSS); higher than 97.4% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: linux (Debian:12) 4.12.6-1; linux (Debian:8) 3.16.43-2+deb8u5; linux (Debian:9) 4.9.30-2+deb9u5.

Low priority for now. Upgrade to linux (Debian:12) 4.12.6-1; linux (Debian:8) 3.16.43-2+deb8u5; linux (Debian:9) 4.9.30-2+deb9u5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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.

HighCVSS 7.0 · v3.1—Weaponized Fix available
Published
Oct 4, 2017
Updated
Jun 16, 2026
EPSS
20.8% · 97th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
6 / 30 · 20.8%

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  • Weaponized exploit exists
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.15 and later · before 3.10.108
  • linux linux kernel3.11 and later · before 3.16.47
  • linux linux kernel3.17 and later · before 3.18.65
  • linux linux kernel3.19 and later · before 4.4.82
  • linux linux kernel4.5 and later · before 4.9.43
  • linux linux kernel4.10 and later · before 4.12.7

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 4.12.6-14.12.6-1
Debian:8linuxbefore 3.16.43-2+deb8u53.16.43-2+deb8u5
Debian:9linuxbefore 4.9.30-2+deb9u54.9.30-2+deb9u5
Red Hat:enterprise_linux:6::clientkernelbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-abi-whitelistsbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-debugbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-debug-debuginfobefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-debug-develbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-debuginfobefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-debuginfo-common-i686before 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-debuginfo-common-x86_64before 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-develbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-docbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-firmwarebefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientkernel-headersbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientperfbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientperf-debuginfobefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientpython-perfbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::clientpython-perf-debuginfobefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::serverkernel-bootwrapperbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::serverkernel-debuginfo-common-ppc64before 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::serverkernel-debuginfo-common-s390xbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::serverkernel-kdumpbefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6
Red Hat:enterprise_linux:6::serverkernel-kdump-debuginfobefore 0:2.6.32-696.16.1.el60:2.6.32-696.16.1.el6

+96

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux4.12.6-1 · Debian:12Package registry (OSV)
red hat:kernel-rt1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-debug1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-debug-debuginfo1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-debug-devel1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-debuginfo1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-debuginfo-common-x86_641:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-devel1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-doc1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-firmware1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-trace1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-trace-debuginfo1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
red hat:kernel-rt-trace-devel1:3.10.0-693.5.2.rt56.592.el6rt · Red Hat:enterprise_mrg:2:server:el6Package registry (OSV)
suse:kernel-default4.4.74-92.35.1 · SUSE:Linux Enterprise Desktop 12 SP2Package registry (OSV)
suse:kernel-docs4.4.74-92.35.3 · SUSE:Linux Enterprise Software Development Kit 12 SP2Package registry (OSV)
suse:kernel-ec23.12.61-52.86.1 · SUSE:Linux Enterprise Module for Public Cloud 12Package registry (OSV)
suse:kernel-obs-build4.4.74-92.35.1 · SUSE:Linux Enterprise Software Development Kit 12 SP2Package registry (OSV)
suse:kernel-source4.4.74-92.35.1 · SUSE:Linux Enterprise Desktop 12 SP2Package registry (OSV)
suse:kernel-syms4.4.74-92.35.1 · SUSE:Linux Enterprise Desktop 12 SP2Package registry (OSV)
suse:kernel-xen3.12.61-52.86.1 · SUSE:Linux Enterprise Server for SAP Applications 12Package registry (OSV)
suse:kgraft-patch-SLE12_Update_251-2.1 · SUSE:Linux Enterprise Server for SAP Applications 12Package registry (OSV)
suse:kgraft-patch-SLE12-SP1_Update_118-2.1 · SUSE:Linux Enterprise Server for SAP Applications 12 SP1Package registry (OSV)
suse:kgraft-patch-SLE12-SP1_Update_191-2.1 · SUSE:OpenStack Cloud 6Package registry (OSV)
suse:kgraft-patch-SLE12-SP2_Update_121-2.1 · SUSE:Linux Enterprise Live Patching 12Package registry (OSV)
suse:kgraft-patch-SLE12-SP3_Update_11-2.1 · SUSE:Linux Enterprise Live Patching 12 SP3Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Exploit-DB entry ×4
  • Proof-of-concept repository on GitHub ×5

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrylocal2018-08-03
Exploit-DB entrylocal2018-08-03
Exploit-DB entrylocal2017-08-13
Exploit-DB entrylocal2018-12-29
Metasploit moduleexploit/linux/local/ufo_privilege_escalationLinux Kernel UDP Fragmentation Offset (UFO) Privilege Escalationexploit2017-08-10
Proof-of-concept repository on GitHubstars:02019-09-17
Proof-of-concept repository on GitHubstars:12020-02-14
Proof-of-concept repository on GitHubstars:12020-05-12
Proof-of-concept repository on GitHubstars:12026-02-02
Proof-of-concept repository on GitHubstars:02026-07-21

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-56 d
  2. First PoC-53 d
  3. Published
  4. TodayOct 14, 2026+3297 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (12 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records