Vulnerability CVE-2018-1091
Published: 2018-03-27

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.

Type:

CWE-119

 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa0768a8713b135848f78fd43ffc208d8ded70
http://openwall.com/lists/oss-security/2018/03/27/4
https://access.redhat.com/errata/RHSA-2018:1318
https://access.redhat.com/security/cve/cve-2018-1091
https://bugzilla.redhat.com/show_bug.cgi?id=1558149
https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded70
https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
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