5.5

CVE-2017-18221: linux linux_kernel Improper Input Validation

Modified
AliasesUBUNTU-CVE-2017-18221DEBIAN-CVE-2017-18221
Published 07-03-2018Last modified 05-08-2024

Vulnerability summary

CVE-2017-18221 is a medium (CVSS 5.5) Improper Input Validation vulnerability in linux linux_kernel. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 39.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.0 (NVD)
EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
SUSE-SU-2018:0834-1SUSE-SU-2018:0848-1USN-3655-1

Timeline

  1. 07-03-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

The __munlock_pagevec function in mm/mlock.c in the Linux kernel before 4.11.4 allows local users to cause a denial of service (NR_MLOCK accounting corruption) via crafted use of mlockall and munlockall system calls.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.45% 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

0 found

No public exploits indexed.

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.

Ubuntu13 products
  • linux< 4.4.0-87.110
  • linux-aws< 4.4.0-1026.35
  • linux-azure-fdeAll versions (No fix recorded)
  • linux-gcp< 4.13.0-1002.5
  • linux-gke< 4.4.0-1022.22 | All versions (No fix recorded)
Debian1 product
  • linux< 4.11.6-1
Linux1 product

3 vendors · 15 products

References

11 links
Show all 11 references