kernel: net/ipv6/tcp_ipv6.c: tcp_v6_syn_recv_sock function allows attackers to cause a denial of service
Published Jan 16, 2018
9.8
CRITICALCVSS 3.1
EPSS 2.63%
Description
The tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c in the Linux kernel through 4.14.11 allows attackers to cause a denial of service (slab out-of-bounds write) or possibly have unspecified other impact via vectors involving TLS.
Affected products
No data.
- ≥ 4.13 · < 4.14.86
- ≥ 4.15 · < 4.15.8
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-alt
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
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-alt | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | 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, and 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. The code of in-kernel TLS implementation with the flaw is not enabled and is not built 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:H/I:H/A:H
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/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 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- 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 | 2.63% (0.02630) | 84.98th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.65% (0.02648) | 83.59th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.19% (0.00186) | 56.22th | v3 (v2023.03.01) |
| May 8, 2023 | 0.19% (0.00186) | 54.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00131) | 46.25th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.52% (0.00518) | 11.68th | v1 |
| Jan 6, 2022 | 0.52% (0.00518) | 11.22th | v1 |
| Sep 1, 2021 | 0.52% (0.00518) | 29.97th | v1 |
| Apr 14, 2021 | 0.52% (0.00518) | 0.00th | v1 |
References (5)
- https://access.redhat.com/security/cve/CVE-2018-5703 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1535110 Issue Tracking
- https://groups.google.com/d/msg/syzkaller-bugs/0PBeVnSzfqQ/5eXAlM46BQAJ x_refsource_MISCIssue TrackingMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-5703
- https://www.cve.org/CVERecord?id=CVE-2018-5703
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2018-5703 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1535110 | Issue Tracking | |
| https://groups.google.com/d/msg/syzkaller-bugs/0PBeVnSzfqQ/5eXAlM46BQAJ | x_refsource_MISCIssue TrackingMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-5703 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-5703 |
Change history (0)
No recorded changes yet.