CVE-2018-7738

Severity: high (CVSS 7.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-07 · updated 2026-06-17

Description

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.

Affected products

util-linux: through 2.31

References

http://www.securityfocus.com/bid/103367
https://bugs.debian.org/892179
https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55
https://github.com/karelzak/util-linux/issues/539
https://usn.ubuntu.com/4512-1/
https://www.debian.org/security/2018/dsa-4134
http://www.securityfocus.com/bid/103367
https://bugs.debian.org/892179
https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55
https://github.com/karelzak/util-linux/issues/539
https://security.netapp.com/advisory/ntap-20241213-0002/
https://usn.ubuntu.com/4512-1/

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