CVE-2018-7191: linux linux_kernel NULL Pointer Dereference
Vulnerability summary
CVE-2018-7191 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux linux_kernel. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 51.3% of scored vulnerabilities. 1 public exploit is recorded.
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 16 · Related 12Timeline
- 17-05-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
In the tun subsystem in the Linux kernel before 4.13.14, dev_get_valid_name is not called before register_netdevice. This allows local users to cause a denial of service (NULL pointer dereference and panic) via an ioctl(TUNSETIFF) call with a dev name containing a / character. This is similar to CVE-2013-4343.
CVSS metrics
5 scores · 3 sources · 3 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
0.65%
Chance of exploitation in the next 30 days
Percentile
51%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.65% 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
1 foundExploit Reference (bugs.launchpad.net)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu37 products
- linuxAll versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.4All versions (No fix recorded)
- linux-aws-fipsAll versions (No fix recorded)
- linux-aws-hweAll versions (No fix recorded)
Debian1 product
- linux< 4.14.2-1
Linux1 product
- linux_kernel< 4.13.14
3 vendors · 39 products
References
16 links- bugs.launchpad.net/ubuntu/+source/linux/+bug/1743792X Refsource MISCExploitThird Party AdvisoryREPORT
- github.com/torvalds/linux/commit/0ad646c81b2182f7fa67ec0c8c825e0ee165696dX Refsource MISCPatchThird Party AdvisoryREPORT
- github.com/torvalds/linux/commit/5c25f65fd1e42685f7ccd80e0621829c105785d9X Refsource MISCPatchThird Party AdvisoryREPORT
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.14X Refsource MISCRelease NotesVendor AdvisoryREPORT
