CVE-2019-15793

Summary

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.

Affected Software

VendorProductVersion RangeStatus
UbuntuShiftfs in the Linux kernel5.3.0-11.12 < 5.3 kernel*affected
UbuntuShiftfs in the Linux kernel5.0 kernel < 5.0.0-35.38affected

Weaknesses

  • CWE-538: CWE-538 File and Directory Information Exposure

ADP Enrichment

CVE Program Container

Additional References

References