Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-006BEE4E-4C49-11E8-9C32-54EE754AF08E:
Google Chrome Releases reports:
3 security fixes in this release:
[831963] Critical CVE-2018-6118: Use after free in Media Cache. Reported by Ned Williamson on 2018-04-12
[837635] Various fixes from internal audits, fuzzing and other initiatives
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