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 | Product | Affected | Fixed |
|---|---|---|---|
| — | Linux kernel v4.13 and newer | Linux kernel v4.13 and newer | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.13.10-1 | — |
| Debian 13 | linux | 4.13.10-1 | — |
| Debian 12 | linux | 4.13.10-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | perf +18 | 3.10.0-862.2.3.el7 | RHSA-2018:1318 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-docs +3 | 4.4.126-94.22.1 | SUSE-SU-2018:1048-1 |
| SLES 12 SP3 | kernel-source | 4.4.126-94.22.2 | SUSE-SU-2018:1048-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.109.2 | SUSE-SU-2019:1287-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_29 | 1-3.5.2 | SUSE-SU-2019:1287-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | kernel-source | 4.4.126-94.22.2 | SUSE-SU-2018:1048-1 |
| SLES for SAP 12 SP3 | kernel-syms +1 | 4.4.126-94.22.1 | SUSE-SU-2018:1048-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.109.2 | SUSE-SU-2019:1287-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_29 | 1-3.5.2 | SUSE-SU-2019:1287-1 |
| SLE Real Time 12 SP3 | kernel-rt +3 | 4.4.128-3.11.1 | SUSE-SU-2018:1217-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_11 | 1-4.5.1 | SUSE-SU-2018:1048-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.109.2 | SUSE-SU-2019:1287-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_29 | 1-3.5.2 | SUSE-SU-2019:1287-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.109.2 | SUSE-SU-2019:1287-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_29 | 1-3.5.2 | SUSE-SU-2019:1287-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | perf +7 | 4.14.42-61.37.amzn2 | ALAS2-2018-1023 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +11 | 3.10.0-862.2.3.el7 | ELSA-2018-1318 |
Advisories 6
- RHSA-2018:1318 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- SUSE-SU-2019:1287-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1217-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1048-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2018-1023 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 29, 2018
- ELSA-2018-1318 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 9, 2018
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1558149
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
- https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2
- https://access.redhat.com/security/cve/cve-2018-1091
- RHSA-2018:1318 vendor-advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa0768a8713b135848f78fd43ffc208d8ded70
- https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded70
- http://openwall.com/lists/oss-security/2018/03/27/4