CVE-2018-18281
High
Description
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedOct 30, 2018
First seenOct 30, 2018
How to fix
Update
- linux linux_kernel4.9.135, 4.14.78, 4.18.16, 4.19 or later
Vendor advisories
- usn.ubuntu.com/3835-1/
- usn.ubuntu.com/3880-1/
- usn.ubuntu.com/3871-5/
- usn.ubuntu.com/3871-4/
- usn.ubuntu.com/3880-2/
- usn.ubuntu.com/3832-1/
- usn.ubuntu.com/3871-1/
- usn.ubuntu.com/3871-3/
- access.redhat.com/errata/RHSA-2019:0831
- access.redhat.com/errata/RHSA-2019:2043
- access.redhat.com/errata/RHSA-2019:2029
- access.redhat.com/errata/RHSA-2020:0036
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.2 ≤ v < 4.9.135, 4.9.136 ≤ v < 4.14.78, 4.14.79 ≤ v < 4.18.16, 4.18.17 ≤ v < 4.19 | 4.9.135, 4.14.78, 4.18.16, 4.19 |
| canonical ubuntu_linux | 12.04, 14.04, 16.04, 18.04, 18.10 | — |
| debian debian_linux | 8.0 | — |
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