title: shiftfs lock unbalance in Ubuntu-specific kernels
description: Jean-Baptiste Cayrou discovered that the shiftfs file system in the Ubuntu Linux kernel contained a race condition when handling inode locking in some situations. A local attacker could use this to cause a denial of service (kernel deadlock).
problem types: CWE-667
affected:
{
collectionURL: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/kinetic/refs/
packageName: ubuntu-linux
platforms: Linux
product: ubuntu-linux
repo: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/kinetic/
vendor: Canonical Ltd.
versions:
status: affected, version: 0, lessThan: 02b47547824b1cd0d55c6744f91886f04de8947e, versionType: commit
}
metrics:
cvssV3_1: [
version: 3.1
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: HIGH
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseSeverity: MEDIUM
baseScore: 4.4
vectorString: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
]
format: CVSS