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Fencer Vulns
medium 5.5

CVE-2018-1091 json

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 trigg…

published 2018-03-27 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11741

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

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.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.13.10-1

debian advisories DEBIAN-CVE-2018-1091

  • kernel RHEL 7 3.10.0-862.2.3.el7
  • perf RHEL 7 3.10.0-862.2.3.el7
  • python-perf RHEL 7 3.10.0-862.2.3.el7
  • kernel-kdump RHEL 7 3.10.0-862.2.3.el7
  • kernel-tools RHEL 7 3.10.0-862.2.3.el7
  • kernel-tools-libs RHEL 7 3.10.0-862.2.3.el7
  • kernel-bootwrapper RHEL 7 3.10.0-862.2.3.el7
  • kernel-abi-whitelists RHEL 7 3.10.0-862.2.3.el7

red hat advisories RHSA-2018:1318

  • kernel-syms SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.121-92.109.2
  • kernel-source SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.121-92.109.2
  • kernel-default SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +3 more 4.4.121-92.109.2
  • kgraft-patch-SLE12-SP2_Update_29 SLES for SAP 12 SP2, SLES 12 SP2-LTSS, OpenStack Cloud 7 +1 more 1-3.5.2
  • kernel-rt SLE Real Time 12 SP3 4.4.128-3.11.1
  • kernel-syms-rt SLE Real Time 12 SP3 4.4.128-3.11.1
  • kernel-rt_debug SLE Real Time 12 SP3 4.4.128-3.11.1
  • kernel-source-rt SLE Real Time 12 SP3 4.4.128-3.11.1

suse advisories SUSE-SU-2019:1287-1SUSE-SU-2018:1217-1SUSE-SU-2018:1048-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-1091 updated cvss 4.7

kernel: guest kernel crash during core dump on POWER9 host

  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-862.2.3.el7, kernel 3.10.0-862.2.3.el7, python-perf 3.10.0-862.2.3.el7, kernel-tools 3.10.0-862.2.3.el7, kernel-tools-libs 3.10.0-862.2.3.el7, kernel-abi-whitelists 3.10.0-862.2.3.el7, +1 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-862.2.3.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-862.2.3.el7, kernel 3.10.0-862.2.3.el7, python-perf 3.10.0-862.2.3.el7, kernel-tools 3.10.0-862.2.3.el7, kernel-tools-libs 3.10.0-862.2.3.el7, kernel-abi-whitelists 3.10.0-862.2.3.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-862.2.3.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perf 3.10.0-862.2.3.el7, kernel 3.10.0-862.2.3.el7, python-perf 3.10.0-862.2.3.el7, kernel-kdump 3.10.0-862.2.3.el7, kernel-tools 3.10.0-862.2.3.el7, kernel-tools-libs 3.10.0-862.2.3.el7, +4 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debuginfo-common-ppc64le 3.10.0-862.2.3.el7
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-862.2.3.el7, kernel 3.10.0-862.2.3.el7, python-perf 3.10.0-862.2.3.el7, kernel-kdump 3.10.0-862.2.3.el7, kernel-tools 3.10.0-862.2.3.el7, kernel-tools-libs 3.10.0-862.2.3.el7, +6 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-862.2.3.el7, kernel-debuginfo-common-x86_64 3.10.0-862.2.3.el7, kernel-debuginfo-common-ppc64le 3.10.0-862.2.3.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-862.2.3.el7, kernel 3.10.0-862.2.3.el7, python-perf 3.10.0-862.2.3.el7, kernel-tools 3.10.0-862.2.3.el7, kernel-tools-libs 3.10.0-862.2.3.el7, kernel-abi-whitelists 3.10.0-862.2.3.el7, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-862.2.3.el7
    fixed: vendor fix RHSA-2018:1318
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, kernel-rt, kernel-alt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • n/a Linux kernel v4.13 and newer

Classification

Weakness
  • CWE-391 DEPRECATED: Unchecked Error Condition
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.