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High severity7.1NVD Advisory· Published Apr 24, 2020· Updated Jun 17, 2026

CVE-2019-15791

CVE-2019-15791

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

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/Linux Kernelllm-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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