CVE-2017-18241: canonical ubuntu_linux NULL Pointer Dereference
Vulnerability summary
CVE-2017-18241 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in canonical ubuntu_linux. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.9% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 6Timeline
- 21-03-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
fs/f2fs/segment.c in the Linux kernel before 4.13 allows local users to cause a denial of service (NULL pointer dereference and panic) by using a noflush_merge option that triggers a NULL value for a flush_cmd_control data structure.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.41%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.41% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu16 products
- linux< 4.4.0-143.169
- linux-aws< 4.4.0-1039.42 | < 4.4.0-1077.87
- linux-azure< 4.13.0-1005.7
- linux-azure-fdeAll versions (No fix recorded)
- linux-fips< 4.4.0-1008.10
Debian2 products
- linux< 4.13.4-1
- debian_linuxEOL8.0 | 9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04
Linux1 product
- linux_kernel< 4.13
4 vendors · 20 products
References
11 links
- github.com/torvalds/linux/commit/d4fdf8ba0e5808ba9ad6b44337783bd9935e0982X Refsource MISCPatchThird Party AdvisoryREPORT