kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service
Published Oct 17, 2018
3.3
LOWCVSS 3.0
EPSS 0.41%
Description
drivers/tty/n_tty.c in the Linux kernel before 4.14.11 allows local attackers (who are able to access pseudo terminals) to hang/block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ.
Affected products
No data.
Configuration 1
- < 4.14.11
Configuration 2
- 12.04
- 14.04
No data.
Red Hat Enterprise Linux 7
kernel-alt-0:4.14.0-115.7.1.el7a
Fixed · RHSA-2019:0831
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 Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise MRG 2
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-alt-0:4.14.0-115.7.1.el7a | Fixed | RHSA-2019:0831 |
| 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 Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
AV:L/AC:L/Au:N/C:N/I:N/A:P
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 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.41% (0.00413) | 33.25th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.41% (0.00413) | 35.27th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.04% (0.00042) | 5.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.89% (0.00888) | 25.41th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.89% (0.00888) | 0.00th | v1 |
References (11)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=966031f340185eddd05affcf72b740549f056348 x_refsource_MISCPatchVendor Advisory
- https://access.redhat.com/errata/RHSA-2019:0831 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2018-18386 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1640598 Issue Tracking
- https://bugzilla.suse.com/show_bug.cgi?id=1094825 x_refsource_MISCIssue TrackingPatchThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.11 x_refsource_MISCPatchRelease NotesThird Party Advisory
- https://github.com/torvalds/linux/commit/966031f340185eddd05affcf72b740549f056348 x_refsource_MISCPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-18386
- https://usn.ubuntu.com/3849-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/3849-2/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-18386
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=966031f340185eddd05affcf72b740549f056348 | x_refsource_MISCPatchVendor Advisory | |
| https://access.redhat.com/errata/RHSA-2019:0831 | vendor-advisoryx_refsource_REDHAT | |
| https://access.redhat.com/security/cve/CVE-2018-18386 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1640598 | Issue Tracking | |
| https://bugzilla.suse.com/show_bug.cgi?id=1094825 | x_refsource_MISCIssue TrackingPatchThird Party Advisory | |
| https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.11 | x_refsource_MISCPatchRelease NotesThird Party Advisory | |
| https://github.com/torvalds/linux/commit/966031f340185eddd05affcf72b740549f056348 | x_refsource_MISCPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-18386 | ||
| https://usn.ubuntu.com/3849-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://usn.ubuntu.com/3849-2/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-18386 |
Change history (0)
No recorded changes yet.