CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
12.6%
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() installs an fd referencing a file from the lower filesystem without taking an additional reference to that file. After the btrfs ioctl completes this fd is closed, which then puts a reference to that file, leading to a refcount underflow.
[
{
"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"
}
]
}
]
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
12.6%