CVE-2018-6797: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2018-6797 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 6.48% chance of exploitation in the next 30 days, higher than 93.7% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 6% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 4Timeline
- 17-04-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes written.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
6.48%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
No change 0.00 pp
From 6.48% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- perl< 5.26.1-6
- debian_linuxEOL8.0 | 9.0
Redhat2 products
- enterprise_linux_server7.0 | 7.3 | 7.4 | 7.5 | 7.6
- enterprise_linux_workstation6.0 | 7.0
Alpine1 product
- perl≥ 5.18, < 5.26.2-r0 | ≥ 5.18, < 5.24.4-r0
Canonical1 product
- ubuntu_linuxEOL16.04 | 17.10
Perl1 product
- perl≥ 5.18, ≤ 5.26
Ubuntu1 product
- perlAll versions (No fix recorded) | < 5.22.1-9ubuntu0.3
6 vendors · 8 products
References
13 links
- www.oracle.com/security-alerts/cpujul2020.htmlX Refsource MISC