kernel: guest kernel crash during core dump on POWER9 host
Published Mar 27, 2018
5.5
MEDIUMCVSS 3.0
EPSS 0.40%
Description
In the flush_tmregs_to_thread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a POWER host due to a missing processor feature check and an erroneous use of transactional memory (TM) instructions in the core dump path, leading to a denial of service.
Affected products
- Vendor n/a Product Linux kernel v4.13 and newer Defaultn/a
- Version Linux kernel v4.13 and newerStatusaffectedConstraints-
- Version
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 | Linux kernel v4.13 and newer | n/a |
|
- ≤ 4.13.4
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-862.2.3.el7
Fixed · RHSA-2018:1318
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
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 7 | kernel-0:3.10.0-862.2.3.el7 | Fixed | RHSA-2018:1318 |
| 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-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
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:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
AV:L/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
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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.40% (0.00403) | 32.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.42% (0.00417) | 33.09th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.08% (0.00082) | 21.64th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00062) | 28.60th | v3 (v2023.03.01) |
| Jun 12, 2024 | 0.06% (0.00062) | 26.56th | v3 (v2023.03.01) |
| Mar 21, 2023 | 0.06% (0.00062) | 24.54th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00045) | 12.06th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.10% (0.01104) | 54.09th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.10% (0.01104) | 52.45th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.10% (0.01104) | 50.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.10% (0.01104) | 28.85th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.31% (0.02314) | 53.75th | v1 |
| Jan 6, 2022 | 2.31% (0.02314) | 53.29th | v1 |
| Sep 1, 2021 | 2.31% (0.02314) | 78.25th | v1 |
| Apr 14, 2021 | 2.31% (0.02314) | 0.00th | v1 |
References (11)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa0768a8713b135848f78fd43ffc208d8ded70 x_refsource_CONFIRMPatchVendor Advisory
- http://openwall.com/lists/oss-security/2018/03/27/4 x_refsource_CONFIRMMailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1318 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2018-1091 Vendor Advisory
- https://access.redhat.com/security/cve/cve-2018-1091 x_refsource_CONFIRMThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1558149 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded70 x_refsource_CONFIRMPatchThird Party Advisory
- https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2 x_refsource_CONFIRMPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-1091
- https://www.cve.org/CVERecord?id=CVE-2018-1091
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5 x_refsource_CONFIRMPatchVendor Advisory
Change history (0)
No recorded changes yet.