UnratedFix available
util-linux: Fix of 4 CVEs
Type: advisorySources: OSV
- CVE-2026-27456: fix TOCTOU symlink race in SUID mount loop device setup that allowed non-root users to access arbitrary root-owned files via symlink swap between path resolution and open
- Products
- libblkid, libblkid-devel, libfdisk, libfdisk-devel, libmount, libmount-devel, libsmartcols, libsmartcols-devel, libuuid, libuuid-devel, python3-libmount, util-linux, util-linux-core, util-linux-user, uuidd
- Affected versions
- Not specified
- Fixed versions
- 2.37.4-21.el9_6.tuxcare.els3
- CVEs
- CVE-2026-27456
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:50 UTC · Revision 1
Source evidence
- CVE-2026-27456: fix TOCTOU symlink race in SUID mount loop device setup that allowed non-root users to access arbitrary root-owned files via symlink swap between path resolution and open
osv:CLSA-2026-1782989143
libblkid
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libblkid-devel
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libfdisk
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libfdisk-devel
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libmount
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libmount-devel
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libsmartcols
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libsmartcols-devel
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libuuid
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
libuuid-devel
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
python3-libmount
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
util-linux
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
util-linux-core
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
util-linux-user
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
uuidd
Fixed versions: 2.37.4-21.el9_6.tuxcare.els3
Complete source record
{
"id": "8e7b0f2739d4a1cfd26dec80d9c8ad6f9590433d95b0ff27e29f8c2dc4e7fb98",
"url": "https://osv.dev/vulnerability/CLSA-2026-1782989143",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "util-linux: Fix of 4 CVEs",
"summary": "- CVE-2026-27456: fix TOCTOU symlink race in SUID mount loop device setup that allowed non-root users to access arbitrary root-owned files via symlink swap between path resolution and open",
"evidence": "osv:CLSA-2026-1782989143",
"products": [
{
"name": {
"value": "libblkid",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.37.4-21.el9_6.tuxcare.els3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
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"evidence": "/affected/2/ranges"
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{
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{
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"evidence": "/affected/4/package/name"
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/6/package/name"
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{
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},
{
"name": {
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"evidence": "/affected/7/ranges"
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/8/package/name"
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"affected_versions": []
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{
"name": {
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],
"affected_versions": []
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{
"name": {
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"evidence": "/affected/10/package/name"
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"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/10/ranges"
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"affected_versions": []
},
{
"name": {
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"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/11/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "util-linux-core",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/12/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "util-linux-user",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/13/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "uuidd",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1782989143",
"aliases": [
"CLSA-2026-1782989143"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "libblkid",
"purl": "pkg:rpm/tuxcare/libblkid?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
},
{
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],
"package": {
"name": "libblkid-devel",
"purl": "pkg:rpm/tuxcare/libblkid-devel?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
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},
{
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"package": {
"name": "libfdisk",
"purl": "pkg:rpm/tuxcare/libfdisk?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
},
{
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],
"package": {
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"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
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{
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],
"package": {
"name": "libmount",
"purl": "pkg:rpm/tuxcare/libmount?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
},
{
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{
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}
]
}
],
"package": {
"name": "libmount-devel",
"purl": "pkg:rpm/tuxcare/libmount-devel?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
},
{
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}
]
}
],
"package": {
"name": "libsmartcols",
"purl": "pkg:rpm/tuxcare/libsmartcols?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
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"package": {
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"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
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],
"package": {
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"purl": "pkg:rpm/tuxcare/libuuid?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
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"package": {
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},
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],
"package": {
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},
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},
{
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]
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],
"package": {
"name": "util-linux-core",
"purl": "pkg:rpm/tuxcare/util-linux-core?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
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},
{
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}
]
}
],
"package": {
"name": "util-linux-user",
"purl": "pkg:rpm/tuxcare/util-linux-user?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "uuidd",
"purl": "pkg:rpm/tuxcare/uuidd?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782989143.json"
}
}
],
"modified": "2026-10-26T09:31:13.078939221Z",
"provider": "osv",
"upstream": [
"CVE-2026-27456"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1782989143.html",
"https://nvd.nist.gov/vuln/detail/CVE-2024-28085",
"https://nvd.nist.gov/vuln/detail/CVE-2025-14104",
"https://nvd.nist.gov/vuln/detail/CVE-2026-27456",
"https://nvd.nist.gov/vuln/detail/CVE-2026-3184"
]
},
"related_cves": [
{
"value": "CVE-2026-27456",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447507,
"published_at": "2026-07-02T10:46:04+00:00"
}