kernel: Arbitrary Kernel Read into dmesg via Missing Address Check in segfault Handler
Published Oct 8, 2018
7.0
HIGHCVSS 3.0
EPSS 0.53%
Description
A missing address check in the callers of the show_opcodes() in the Linux kernel allows an attacker to dump the kernel memory at an arbitrary kernel address into the dmesg log.
Affected products
- Vendor n/a Product Kernel Defaultn/a
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||
|---|---|---|---|---|---|---|
| n/a | Kernel | n/a |
|
- ≤ 4.18
- 4.19
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 Linux 8
kernel-rt
Not affected
Red Hat Enterprise MRG 2
kernel-rt
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 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:H/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:P/I:N/A:N
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 v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.53% (0.00528) | 42.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.53% (0.00528) | 40.24th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.10% (0.00095) | 24.58th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00059) | 26.87th | v3 (v2023.03.01) |
| Jun 21, 2024 | 0.06% (0.00059) | 25.13th | v3 (v2023.03.01) |
| Oct 2, 2023 | 0.06% (0.00059) | 23.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00046) | 14.06th | 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 | 1.45% (0.01454) | 32.67th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (10)
- http://www.securitytracker.com/id/1041804 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-14656 Vendor Advisory
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1650 x_refsource_MISCIssue TrackingPatchThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1629940 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14656 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=342db04ae71273322f0011384a9ed414df8bdae4 x_refsource_CONFIRMPatchThird Party Advisory
- https://lore.kernel.org/lkml/20180828154901.112726-1-jannh%40google.com/T/ x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2018-14656
- https://seclists.org/oss-sec/2018/q4/9 x_refsource_MISCMailing ListPatchThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-14656
| Link | Providers | Tags |
|---|---|---|
| http://www.securitytracker.com/id/1041804 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2018-14656 | Vendor Advisory | |
| https://bugs.chromium.org/p/project-zero/issues/detail?id=1650 | x_refsource_MISCIssue TrackingPatchThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1629940 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14656 | x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory | |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=342db04ae71273322f0011384a9ed414df8bdae4 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://lore.kernel.org/lkml/20180828154901.112726-1-jannh%40google.com/T/ | x_refsource_MISC | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-14656 | ||
| https://seclists.org/oss-sec/2018/q4/9 | x_refsource_MISCMailing ListPatchThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-14656 |
Change history (6)
- MITRE
- CVSS severity changed from MEDIUM to
HIGH MEDIUM → HIGH
- CVSS vector changed from CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N to
CVSS:3.0/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:N/A:N → CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS score changed from 4.7 to
7 4.7 → 7
- CVSS severity changed from MEDIUM to
HIGH
- REDHAT
- CVSS severity changed from HIGH to
MEDIUM HIGH → MEDIUM
- CVSS vector changed from CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H to
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS:3.0/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:N/A:N
- CVSS score changed from 7 to
4.7 7 → 4.7
- CVSS severity changed from HIGH to
MEDIUM