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2018-03-27
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.
| Products | Linux_kernel |
| Type | Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) |
| First patch |
https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded70 |
| Relevant file/s | ./arch/powerpc/kernel/ptrace.c (modified, +1, -1) |
| Links |
• https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2
• https://access.redhat.com/security/cve/cve-2018-1091 • https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5 • https://access.redhat.com/errata/RHSA-2018:1318 • http://openwall.com/lists/oss-security/2018/03/27/4 |
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