CVE-2018-1091

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.

Weakness

[PLANNED FOR DEPRECATION. SEE MAINTENANCE NOTES AND CONSIDER CWE-252, CWE-248, OR CWE-1069.] Ignoring exceptions and other error conditions may allow an attacker to induce unexpected behavior unnoticed.

Affected Software

Potential Mitigations

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\u0026m=150535531910494\u0026w=2
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
• 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\u0026m=150535531910494\u0026w=2
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5