CVE-2018-18281

Advisory lineage Upstream: 0 Downstream: 33
Modified
Published: 30 Oct 2018, 18:00
Last modified:05 Aug 2024, 11:08

Vulnerability Summary

Overall Risk (default)
medium
41/100
CVSS Score
7.8 HIGH
v3.0 (nvd)
EPSS Score
0.23% LOW
0% probability -0.17%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

30 Oct 2018, 18:00
Published
Vulnerability first disclosed
05 Aug 2024, 11:08
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.0•HIGH•Score: 7.8CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.23%• Percentile: 45%

Techniques & Countermeasures

  • CWE-459•Incomplete Cleanup

    The product does not properly "clean up" and remove temporary or supporting resources after they have been used.

Affected Systems

  • canonical•ubuntu_linux

    12.04 | 14.04 | 16.04 | 18.04 | 18.10

  • debian•debian_linux

    8.0

  • linux•linux_kernel

    ≥ 3.2, < 4.9.135 | ≥ 4.9.136, < 4.14.78 | ≥ 4.14.79, < 4.18.16 | ≥ 4.18.17, < 4.19

References (27)