High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-7738
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 10:30 UTC · Revision 1
Source evidence
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.
osv:CVE-2018-7738
Complete source record
{
"id": "dbbada58ee3f353bd270ac908e15af74091ecbd490880a0658994c8b72ebd830",
"url": "https://osv.dev/vulnerability/CVE-2018-7738",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-7738",
"summary": "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.",
"evidence": "osv:CVE-2018-7738",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-7738",
"aliases": [
"CVE-2018-7738"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/util-linux/util-linux",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "27e66e59a39f63cfbc120bf1d26bc6b63f1b4f6c"
},
{
"fixed": "75f03badd7ed9f1dd951863d75e756883d3acc55"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "2.31"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "75f03badd7ed9f1dd951863d75e756883d3acc55"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2.31",
"v2.31-rc2",
"v2.31-rc1",
"v2.30",
"v2.30-rc2",
"v2.30-rc1",
"v2.29",
"v2.29-rc2",
"v2.29-rc1",
"v2.28",
"v2.28-rc2",
"v2.28-rc1",
"v2.27",
"v2.27-rc2",
"v2.27-rc1",
"v2.26",
"v2.26-rc2",
"v2.26-rc1",
"v2.25",
"v2.25-rc2",
"v2.25-rc1",
"v2.24",
"v2.24-rc2",
"v2.24-rc1",
"v2.23",
"v2.23-rc2",
"v2.23-rc1",
"v2.22",
"v2.22-rc2",
"v2.22-rc1",
"v2.21",
"v2.21-rc2",
"v2.21-rc1",
"v2.20",
"v2.20-rc2",
"v2.20-rc1",
"v2.19",
"v2.19-rc3",
"v2.19-rc2",
"v2.19-rc1",
"v2.18",
"v2.18-rc2",
"v2.18-rc1",
"v2.17",
"v2.17-rc3",
"v2.17-rc2",
"v2.17-rc1",
"v2.16",
"v2.16-rc2",
"v2.16-rc1",
"v2.15",
"v2.15-rc2",
"v2.15-rc1",
"v2.14",
"v2.14-rc3",
"v2.14-rc2",
"v2.14-rc1",
"v2.13",
"v2.13-rc3",
"v2.13-rc2",
"v2.13-rc1",
"v2.13-pre7",
"v2.13-pre6",
"v2.13-pre5",
"v2.13-pre4",
"v2.13-pre3",
"v2.13-pre2",
"v2.13-pre1",
"v2.12r",
"v2.12r-pre1",
"v2.12q",
"v2.12q-pre2",
"v2.12q-pre1",
"v2.12p",
"v2.12o",
"v2.12m",
"v2.12l",
"v2.12k",
"v2.12j",
"v2.12i",
"v2.12h",
"v2.12d",
"v2.12b",
"v2.12a",
"v2.12pre",
"v2.12",
"v2.11y",
"v2.11x",
"v2.11w",
"v2.11v",
"v2.11u",
"v2.11t",
"v2.11r",
"v2.11q",
"v2.11o",
"v2.11n",
"v2.11m",
"v2.11f",
"v2.11b",
"v2.10s",
"v2.10m",
"v2.10f",
"v2.9v",
"v2.9i",
"v2.8",
"v2.7.1",
"v2.5",
"v2.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-7738.json"
}
}
],
"modified": "2026-10-20T10:50:30.437074646Z",
"provider": "osv",
"references": [
"https://usn.ubuntu.com/4512-1/",
"https://security.netapp.com/advisory/ntap-20241213-0002/",
"https://www.debian.org/security/2018/dsa-4134",
"https://github.com/karelzak/util-linux/issues/539",
"https://bugs.debian.org/892179",
"https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2018-7738",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 381772,
"published_at": "2018-03-07T02:29:03.533+00:00"
}