title: aufs: improperly managed inode reference counts in the vfsub_dentry_open() method
description: It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.
problem types: CWE-911 Improper Update of Reference Count
affected:
{
vendor: Ubuntu
product: Linux kernel (aufs filesystem module)
versions:
version: 4.4.0-186.216, status: unaffected, lessThan: 4.4*, versionType: custom
version: 4.15.0-112.113, status: unaffected, lessThan: 4.15*, versionType: custom
version: 5.4.0-42.46, status: unaffected, lessThan: 5.4*, versionType: custom
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: HIGH
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 4.4
baseSeverity: MEDIUM
]