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

CVE-2019-15794

CVE-2019-15794

Description

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_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:19.10:*:*:*:*:*:*:*
  • 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-fuzzy2 versions
    5.0, 5.3+ 1 more
    • (no CPE)range: 5.0, 5.3
    • (no CPE)range: 5.3 kernel

Patches

Vulnerability mechanics

References

4

News mentions

0

No linked articles in our index yet.