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Operation on a Resource after Expiration or Release The advisory has been revoked - it doesn't affect any version of package kernel-headers  (opens in a new tab)

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EPSS
1.06% (63rd percentile)

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  • Snyk IDSNYK-RHEL7-KERNELHEADERS-4771492
  • published26 Jul 2021
  • disclosed18 Oct 2018
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Introduced: 18 Oct 2018

CVE-2018-18281  (opens in a new tab)
CWE-672  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by RHEL.

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