kernel: potential division by zero in TCP code
Published May 2, 2016
7.5
HIGHCVSS 3.1
EPSS 3.32%
Description
The tcp_cwnd_reduction function in net/ipv4/tcp_input.c in the Linux kernel before 4.3.5 allows remote attackers to cause a denial of service (divide-by-zero error and system crash) via crafted TCP traffic.
Affected products
No data.
- ≥ 4.3 · < 4.3.5
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as the code with the flaw is not present in the products listed.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/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 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.32% (0.03322) | 88.19th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.32% (0.03322) | 86.97th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.64% (0.00636) | 68.04th | v4 (v2025.03.14) |
| Mar 29, 2025 | 1.77% (0.01771) | 71.37th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.64% (0.00636) | 68.72th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.19% (0.01190) | 85.75th | v3 (v2023.03.01) |
| May 8, 2024 | 1.19% (0.01190) | 85.02th | v3 (v2023.03.01) |
| May 8, 2023 | 1.19% (0.01190) | 83.02th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.84% (0.00843) | 79.55th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (8)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8b8a321ff72c785ed5e8b4cf6eda20b35d427390 x_refsource_CONFIRMVendor Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5 x_refsource_CONFIRMVendor Advisory
- http://www.openwall.com/lists/oss-security/2016/01/25/5 mailing-listx_refsource_MLISTMailing List
- https://access.redhat.com/security/cve/CVE-2016-2070 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1302219 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/8b8a321ff72c785ed5e8b4cf6eda20b35d427390 x_refsource_CONFIRMPatchVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-2070
- https://www.cve.org/CVERecord?id=CVE-2016-2070
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8b8a321ff72c785ed5e8b4cf6eda20b35d427390 | x_refsource_CONFIRMVendor Advisory | |
| http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5 | x_refsource_CONFIRMVendor Advisory | |
| http://www.openwall.com/lists/oss-security/2016/01/25/5 | mailing-listx_refsource_MLISTMailing List | |
| https://access.redhat.com/security/cve/CVE-2016-2070 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1302219 | x_refsource_CONFIRMIssue Tracking | |
| https://github.com/torvalds/linux/commit/8b8a321ff72c785ed5e8b4cf6eda20b35d427390 | x_refsource_CONFIRMPatchVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-2070 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-2070 |
Change history (0)
No recorded changes yet.