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Operation on a Resource after Expiration or Release Affecting kernel-rt package, versions <0:3.10.0-1062.rt56.1022.el7

Severity

 Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.11% (46th percentile)

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  • Snyk ID SNYK-RHEL7-KERNELRT-4901737
  • published 26 Jul 2021
  • disclosed 18 Oct 2018
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Introduced: 18 Oct 2018

CVE-2018-18281 Open this link in a new tab
CWE-672 Open this link in a new tab

How to fix?

Upgrade RHEL:7 kernel-rt to version 0:3.10.0-1062.rt56.1022.el7 or higher.
This issue was patched in RHSA-2019:2043.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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.

References