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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
n/a Linux kernel v4.13 and newer
Linux kernel v4.13 and neweraffected
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 ↗
- https://access.redhat.com/errata/RHSA-2018:1318 ↗
- 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 ↗