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Incomplete Cleanup Affecting linux-4.9 package, versions <4.9.144-3.1~deb8u1

Severity

 Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.24% (62nd percentile)

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  • Snyk IDSNYK-DEBIAN8-LINUX49-340567
  • published2 Dec 2018
  • disclosed30 Oct 2018
Report a new vulnerability Found a mistake?

Introduced: 30 Oct 2018

CVE-2018-18281  (opens in a new tab)
CWE-459  (opens in a new tab)

How to fix?

Upgrade Debian:8 linux-4.9 to version 4.9.144-3.1~deb8u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-4.9 package and not the linux-4.9 package as distributed by Debian. See How to fix? for Debian:8 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