7.8

CVE-2018-18281: canonical ubuntu_linux Incomplete Cleanup

Modified
AliasesUBUNTU-CVE-2018-18281DEBIAN-CVE-2018-18281
Published 30-10-2018Last modified 05-08-2024

Vulnerability summary

CVE-2018-18281 is a high (CVSS 7.8) Incomplete Cleanup vulnerability in canonical ubuntu_linux. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.8% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.0 (NVD)
EPSS score
1.10%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 31 · Related 19
DLA-1715-1DLA-1731-1MGASA-2018-0417MGASA-2018-0418MGASA-2018-0419RHSA-2019:0831

Timeline

  1. 30-10-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability 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

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.10%

Chance of exploitation in the next 30 days

Percentile

66%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 1.06% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugs.chromium.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu17 products
  • linux< 3.13.0-165.215 | < 4.4.0-142.168 | < 4.15.0-44.47
  • linux-aws< 4.4.0-1038.41 | < 4.4.0-1075.85 | < 4.15.0-1032.34
  • linux-aws-hwe< 4.15.0-1032.34~16.04.1
  • linux-azure< 4.15.0-1037.39~14.04.2 | < 4.15.0-1037.39~16.04.1 | < 4.15.0-1037.39
  • linux-azure-fdeAll versions (No fix recorded)
Debian2 products
Canonical1 product
Linux1 product
  • linux_kernel≥ 3.2, < 4.9.135 | ≥ 4.9.136, < 4.14.78 | ≥ 4.14.79, < 4.18.16 | ≥ 4.18.17, < 4.19

4 vendors · 21 products

References

39 links
Show all 39 references