CVEvulnerability

CVE-2018-18281

7.8 HIGH Published 2018-10-30 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2018-10-30
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.0 ([email protected])
7.8 HIGH — CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-459

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.

Affected configurations

• linux linux kernel (>= 3.2 < 4.9.135) • linux linux kernel (>= 4.9.136 < 4.14.78) • linux linux kernel (>= 4.14.79 < 4.18.16) • linux linux kernel (>= 4.18.17 < 4.19) • canonical ubuntu linux 12.04 • canonical ubuntu linux 14.04 • canonical ubuntu linux 16.04 • canonical ubuntu linux 18.04 • canonical ubuntu linux 18.10 • debian debian linux 8.0

Related

Weakness · CWE (1)

  • CWE-459 Incomplete Cleanup weakness

References