"TITLE":"Mishandling of file-system uid/gid with namespaces in shiftfs"
},
"affects":{
"vendor":{
"vendor_data":[
{
"product":{
"product_data":[
{
"product_name":"Shiftfs in the Linux kernel",
"version":{
"version_data":[
{
"version_affected":">=",
"version_name":"5.3 kernel",
"version_value":"5.3.0-11.12"
},
{
"version_affected":"<",
"version_name":"5.3 kernel",
"version_value":"5.3.0-22.24"
},
{
"version_affected":"<",
"version_name":"5.0 kernel",
"version_value":"5.0.0-35.38"
}
]
}
}
]
},
"vendor_name":"Ubuntu"
}
]
}
},
"credit":[
{
"lang":"eng",
"value":"Jann Horn of Google Project Zero"
}
],
"data_format":"MITRE",
"data_type":"CVE",
"data_version":"4.0",
"description":{
"description_data":[
{
"lang":"eng",
"value":"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."
