CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
5.1%
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.
[
{
"product": "Shiftfs in the Linux kernel",
"vendor": "Ubuntu",
"versions": [
{
"changes": [
{
"at": "5.3.0-22.24",
"status": "unaffected"
}
],
"lessThan": "5.3 kernel*",
"status": "affected",
"version": "5.3.0-11.12",
"versionType": "custom"
},
{
"lessThan": "5.0.0-35.38",
"status": "affected",
"version": "5.0 kernel",
"versionType": "custom"
}
]
}
]