National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-18281 Detail

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.

Source:  MITRE
Description Last Modified:  10/30/2018

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/150001/Linux-mremap-TLB-Flush-Too-Late.html
http://www.openwall.com/lists/oss-security/2018/10/29/5
http://www.securityfocus.com/bid/105761
https://bugs.chromium.org/p/project-zero/issues/detail?id=1695
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.78
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.16
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.135
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb66ae030829605d61fbef1909ce310e29f78821

Technical Details

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Change History

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Quick Info

CVE Dictionary Entry:
CVE-2018-18281
NVD Published Date:
10/30/2018
NVD Last Modified:
11/01/2018