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Medium severity6.5NVD Advisory· Published Apr 24, 2020· Updated Jun 17, 2026

CVE-2019-15793

CVE-2019-15793

Description

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.

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Affected products

6
  • Canonical/Ubuntu Linux2 versions
    cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*+ 1 more
    • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
    • cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
  • Linux/Kernel2 versions
    cpe:2.3:o:linux:linux_kernel:5.0:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:linux:linux_kernel:5.0:*:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.3:*:*:*:*:*:*:*
  • Ubuntu/Linuxllm-fuzzy
    Range: 5.0, 5.3
  • Ubuntu/Shiftfs in the Linux kernelv5
    Range: 5.3.0-11.12

Patches

Vulnerability mechanics

References

3

News mentions

0

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