Vulnerability in Kernel Util-Linux
CVE-2018-7738
In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (37.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Public proof-of-concept exploits
References
- github.com/karelzak/util-linux/issues/539 (Third Party Advisory, Issue Tracking)
- www.debian.org/security/2018/dsa-4134 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/103367 (VDB Entry, Third Party Advisory, vdb-entry)
- bugs.debian.org/892179 (Patch, Third Party Advisory)
- github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55 (Patch, Third Party Advisory)
- usn.ubuntu.com/4512-1/ (vendor-advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2018-7738?
- CVE-2018-7738 is a high-severity vulnerability in Kernel Util-Linux. CVSS score: 7.8/10. Published 2018-03-07.
- How severe is CVE-2018-7738?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2018-7738 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.