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Vulnerability details: VCID-f1h6-9jeh-aaae
Vulnerability ID VCID-f1h6-9jeh-aaae
Aliases CVE-2021-3996
Summary A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
Status Published
Exploitability 0.5
Weighted Severity 5.0
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-552 Files or Directories Accessible to External Parties
System Score Found at
cvssv3 5.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3996.json
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
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epss 0.00137 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
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epss 0.00152 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
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epss 0.002 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
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epss 0.00218 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
epss 0.00218 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
epss 0.00218 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
epss 0.00232 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
epss 0.00232 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
epss 0.00232 https://api.first.org/data/v1/epss?cve=CVE-2021-3996
cvssv3.1 5.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3 5.5 https://nvd.nist.gov/vuln/detail/CVE-2021-3996
cvssv3.1 5.5 https://nvd.nist.gov/vuln/detail/CVE-2021-3996
Reference id Reference type URL
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3996.json
https://access.redhat.com/security/cve/CVE-2021-3996
https://api.first.org/data/v1/epss?cve=CVE-2021-3996
https://bugzilla.redhat.com/show_bug.cgi?id=2024628
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3995
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3996
http://seclists.org/fulldisclosure/2022/Dec/4
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
https://security.netapp.com/advisory/ntap-20221209-0002/
https://www.openwall.com/lists/oss-security/2022/01/24/2
http://www.openwall.com/lists/oss-security/2022/11/30/2
cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
CVE-2021-3996 https://nvd.nist.gov/vuln/detail/CVE-2021-3996
GLSA-202401-08 https://security.gentoo.org/glsa/202401-08
USN-5279-1 https://usn.ubuntu.com/5279-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3996.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3996
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3996
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.05128
EPSS Score 0.00042
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.