9.8

CVE-2018-7548: canonical ubuntu_linux NULL Pointer Dereference

CVSS: 9.8v3.0CriticalModified
AliasesDEBIAN-CVE-2018-7548
Published 27-02-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-7548 is a critical (CVSS 9.8) NULL Pointer Dereference vulnerability in canonical ubuntu_linux. EPSS estimates a 2.54% chance of exploitation in the next 30 days, higher than 84.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
2.54%
0%100%
Low · +0.25 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2018-0168

Timeline

  1. 27-02-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.54%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

+0.25 pp

From 2.29% on 21-09-2026

21-09-202621-10-2026
EPSS score
2.54%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Canonical1 product
Debian1 product
  • zsh< 5.5-1
Zsh1 product

3 vendors · 3 products

References

4 links