Incomplete Cleanup
CVE-2018-18281
Summary
Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.
- LOW
- LOCAL
- HIGH
- UNCHANGED
- NONE
- LOW
- HIGH
- HIGH
CWE-459 - Incomplete Cleanup
The software does not properly "clean up" and remove temporary or supporting resources after they have been used.
References
Advisory Timeline
- Published