kernel: Exploitable memory corruption due to UFO to non-UFO path switch
Published Oct 4, 2017
7.0
HIGHCVSS 3.1
EPSS 20.80%
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.
Affected products
No data.
- ≥ 2.6.15 · < 3.10.108
- ≥ 3.11 · < 3.16.47
- ≥ 3.17 · < 3.18.65
- ≥ 3.19 · < 4.4.82
- ≥ 4.5 · < 4.9.43
- ≥ 4.10 · < 4.12.7
No data.
Red Hat Enterprise Linux 5 Extended Lifecycle Support
kernel-0:2.6.18-438.el5
Fixed · RHSA-2019:1931
Red Hat Enterprise Linux 5.9 Long Life
kernel-0:2.6.18-348.44.1.el5
Fixed · RHSA-2019:1932
Red Hat Enterprise Linux 6
kernel-0:2.6.32-696.16.1.el6
Fixed · RHSA-2017:3200
Red Hat Enterprise Linux 7
kernel-0:3.10.0-693.5.2.el7
Fixed · RHSA-2017:2930
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-693.5.2.rt56.626.el7
Fixed · RHSA-2017:2931
Red Hat Enterprise Linux 7.3 Advanced Update Support
kernel-0:3.10.0-514.71.1.el7
Fixed · RHSA-2019:4159
Red Hat Enterprise Linux 7.3 Telco Extended Update Support
kernel-0:3.10.0-514.71.1.el7
Fixed · RHSA-2019:4159
Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions
kernel-0:3.10.0-514.71.1.el7
Fixed · RHSA-2019:4159
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-693.5.2.rt56.592.el6rt
Fixed · RHSA-2017:2918
Red Hat Enterprise Linux 7
kernel-alt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 Extended Lifecycle Support | kernel-0:2.6.18-438.el5 | Fixed | RHSA-2019:1931 |
| Red Hat Enterprise Linux 5.9 Long Life | kernel-0:2.6.18-348.44.1.el5 | Fixed | RHSA-2019:1932 |
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-696.16.1.el6 | Fixed | RHSA-2017:3200 |
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-693.5.2.el7 | Fixed | RHSA-2017:2930 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-693.5.2.rt56.626.el7 | Fixed | RHSA-2017:2931 |
| Red Hat Enterprise Linux 7.3 Advanced Update Support | kernel-0:3.10.0-514.71.1.el7 | Fixed | RHSA-2019:4159 |
| Red Hat Enterprise Linux 7.3 Telco Extended Update Support | kernel-0:3.10.0-514.71.1.el7 | Fixed | RHSA-2019:4159 |
| Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions | kernel-0:3.10.0-514.71.1.el7 | Fixed | RHSA-2019:4159 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-693.5.2.rt56.592.el6rt | Fixed | RHSA-2017:2918 |
| Red Hat Enterprise Linux 7 | kernel-alt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5,6, 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:M/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (21 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 20.80% (0.20797) | 97.48th | v5 (v2026.06.15) |
| Jun 15, 2026 | 20.80% (0.20797) | 97.21th | v5 (v2026.06.15) |
| Feb 17, 2026 | 83.70% (0.83696) | 99.27th | v4 (v2025.03.14) |
| Dec 25, 2025 | 82.32% (0.82320) | 99.18th | v4 (v2025.03.14) |
| May 22, 2025 | 84.29% (0.84291) | 99.25th | v4 (v2025.03.14) |
| May 3, 2025 | 82.70% (0.82702) | 99.18th | v4 (v2025.03.14) |
| Mar 28, 2025 | 80.64% (0.80638) | 99.09th | v4 (v2025.03.14) |
| Mar 23, 2025 | 79.12% (0.79115) | 99.00th | v4 (v2025.03.14) |
| Mar 17, 2025 | 80.68% (0.80681) | 99.10th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00089) | 39.70th | v3 (v2023.03.01) |
| Apr 29, 2023 | 0.09% (0.00089) | 36.59th | v3 (v2023.03.01) |
| Apr 5, 2023 | 0.10% (0.00099) | 39.53th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.09% (0.00089) | 36.30th | v3 (v2023.03.01) |
| Mar 6, 2023 | 15.85% (0.15854) | 96.09th | v2 (v2022.01.01) |
| Apr 1, 2022 | 15.85% (0.15854) | 95.73th | v2 (v2022.01.01) |
| Feb 4, 2022 | 15.85% (0.15854) | 92.67th | v2 (v2022.01.01) |
| Feb 3, 2022 | 44.51% (0.44510) | 98.85th | v1 |
| Sep 16, 2021 | 44.51% (0.44510) | 99.47th | v1 |
| Sep 14, 2021 | 9.79% (0.09792) | 95.00th | v1 |
| Sep 1, 2021 | 44.51% (0.44510) | 99.47th | v1 |
| Apr 14, 2021 | 44.51% (0.44510) | 0.00th | v1 |
References (17)
- http://seclists.org/oss-sec/2017/q3/277 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://www.debian.org/security/2017/dsa-3981 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/bid/100262 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039162 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:2918 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2930 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2931 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3200 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1931 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1932 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4159 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-1000112 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1479307 Issue Tracking
- https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112 x_refsource_MISCThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-1000112
- https://www.cve.org/CVERecord?id=CVE-2017-1000112
- https://www.exploit-db.com/exploits/45147/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
Change history (0)
No recorded changes yet.